PLAN-rebase-commit phase 02: rebase planners¶

Prompt¶

Before responding to questions or discussion points in this document, explore the instar codebase thoroughly. Read relevant source files, understand existing patterns (the *Plan / *Patch types in src/crates/resize/, the qcow2 header / backing-file / refcount primitives in src/crates/qcow2/, the vmdk descriptor parsing in src/crates/vmdk/, the create backing-file write paths in src/crates/create/), and ground your answers in what the code actually does today. Do not speculate about the codebase when you could read it instead. Where a question touches on external concepts (QCOW2 backing chains, vmdk monolithicSparse layout, qemu-img rebase safe mode), research as needed to give a confident answer.

Phase plans for the parent master plan live alongside it in docs/plans/ and are named PLAN-rebase-commit-phase-NN-<descriptive>.md. The master plan is PLAN-rebase-commit.md. Phase 1 (PLAN-rebase-commit-phase-01-abi.md) landed the shared ABI; this phase is the second of twelve.

I prefer one commit per logical step. The step table below identifies seven steps; this phase can land as one commit covering all of them, or split with one commit per step if the management session prefers reviewing in smaller bites. Either way each commit must be self-contained: build, lint, pass tests.

Situation¶

Phase 1 shipped the shared data types and call-table entries that instar rebase will use at runtime (RebaseConfig, RebaseResult, send_rebase_result, write_input_sector). This phase delivers the planner crate that converts a parsed overlay header + a rebase request into the set of mutations the guest will execute against the overlay.

The work falls into two halves:

Unsafe mode (-u): rewrite only the backing-file pointer in the overlay's header. No chain reading, no data copy. For qcow2 this is a small write to the header fields plus the path string; for vmdk monolithicSparse it is a descriptor rewrite that changes parentFileNameHint= and parentCID=. The planner can express both as a small RebasePlan of byte-level patches that the guest applies in order.
Safe mode (default): for every guest cluster, the guest must compare the old chain's view against the new chain's view, and if they differ and the overlay does not own that cluster, copy the old chain's data into a freshly allocated overlay cluster. This is the first instar operation where the planner cannot pre-compute the patch list. Data comparison is inherently a runtime operation. The planner's job in safe mode is to produce the metadata the guest needs to drive that comparison loop:
The set of guest clusters in scope (count, size).
The allocation state machine: where the overlay's refcount table lives, which refcount blocks already exist, where new clusters would go if allocated, and a pure function the guest calls each time it decides a copy is needed.
The final header rewrite patch, to be applied after the comparison loop completes.

The relevant existing infrastructure this phase builds on:

Resize crate as the planner template (src/crates/resize/src/lib.rs). Crate layout, the ResizePatch enum (Write / Append / ZeroFill at lines 110–144), the ResizePlan struct with an inline [ResizePatch; MAX_RESIZE_PATCHES] (lines 164–210), and the ResizeError enum (lines 28–86) are the structural template for RebasePatch / RebasePlan / RebaseError. The crate is no_std, takes caller-supplied scratch buffers, and is unit-tested under tests/.
qcow2 header parsing (src/crates/qcow2/src/lib.rs). QcowHeader::parse at line 334, BACKING_FILE_OFFSET_OFFSET = 8 and BACKING_FILE_SIZE_OFFSET = 16 at lines 44–45, the backing-format extension constant EXT_BACKING_FORMAT = 0xE2792ACA at line 60, and parse_header_extensions at lines 470–536.
qcow2 refcount primitive (src/crates/qcow2/src/lib.rs:2980 lookup_refcount). Already public; the safe-mode allocator builds on this to scan for free clusters across all refcount widths (1, 2, 4, 8, 16, 32, 64 bits).
qcow2 L2 entry semantics: standard 8-byte BE entries, or 16-byte extended L2 entries (cluster pointer in upper 8 bytes, subcluster bitmap in lower 8 bytes). Resize's qcow2 planner already treats extended L2 as "fully allocated" (see src/crates/resize/src/qcow2.rs); rebase will follow the same convention until subcluster-level rebase is needed.
vmdk descriptor parsing (src/crates/vmdk/src/lib.rs:1081 read_and_parse_descriptor and line 1114 parse_descriptor). Extracts CID=, parentCID=, and the extent lines that carry the parentFileNameHint= reference. The descriptor lives at header.desc_offset_sectors * 512, sized desc_size_sectors * 512.
Create backing-file emitters (src/crates/create/src/lib.rs). build_vmdk_descriptor_with_backing(cid, parent_cid, backing_path) already emits a fresh descriptor with all three reference fields. The qcow2 equivalent build_header already writes the backing_file_offset / backing_file_size fields and appends the path string; rebase reuses the same byte layout for in-place updates.
Phase 1 ABI (src/shared/src/lib.rs). RebaseConfig carries new_backing_path: [u8; 1024], new_backing_path_len: u32, overlay_cluster_size, the chain-slot delimiters, and the FLAG_UNSAFE / FLAG_DETACH / FLAG_QUIET flags. RebaseResult::ERROR_* codes 0–6 are append-only and map to the RebaseError enum this phase introduces.
Fuzz target layout (src/fuzz/fuzz_targets/fuzz_resize_planners.rs). Phase 10 will add fuzz_rebase_planners.rs against the public entry points this phase ships; the planner must expose fuzz-friendly entry points (pure functions on raw byte slices, no CallTable).

Mission and problem statement¶

After phase 2 lands:

A new no_std crate src/crates/rebase/ exists, declared in the workspace src/Cargo.toml and depending on shared, qcow2, vmdk, and create (for the backing-path emit helpers).
The crate's public surface in src/crates/rebase/src/lib.rs exposes:
RebasePatch<'a> (the same Write / Append / ZeroFill trio as ResizePatch, copied not abstracted — resize's enum is pub and stable but the rebase use case is small enough that adding a dependency between the two crates would be premature).
RebasePlan<'a> with inline [RebasePatch; N] and methods patches(), push(), total_file_size.
RebaseError enum with at least these variants (one-to-one with RebaseResult::ERROR_* from phase 1 where applicable): UnsupportedFormat, NewBackingIncompatible, ExternalDataFile, LuksUnsupported, ChainDepth, HeaderMismatch, BackingPathTooLong, ScratchTooSmall, OverlayCorrupt, RefcountExhausted, Overflow, ParseFailed. The enum is #[derive(Debug, Clone, Copy, PartialEq, Eq)].
Qcow2RebaseOpts<'a> carrying the parsed QcowHeader, the existing header bytes, the existing refcount-table bytes (for the safe-mode allocator), the new backing path slice, the new backing format, and the mode flag.
VmdkRebaseOpts<'a> carrying the parsed Vmdk4Header, the existing descriptor bytes, the existing grain directory bytes, the new backing path slice, and the new parent CID. The new parent CID is the new backing's CID; the host pre-reads it before populating VmdkRebaseOpts.
plan_rebase_qcow2(opts: &Qcow2RebaseOpts<'_>, scratch: &'a mut [u8]) -> Result<Qcow2RebaseOutput<'a>, RebaseError> (see open question 1 for the unified vs split entry shape).
plan_rebase_vmdk(opts: &VmdkRebaseOpts<'_>, scratch: &'a mut [u8]) -> Result<VmdkRebaseOutput<'a>, RebaseError>.
Qcow2RebaseOutput and VmdkRebaseOutput — see open question 2.
For unsafe mode the planner produces a RebasePlan that the guest can apply directly:
qcow2: a Write patch for the header fields (backing_file_offset, backing_file_size, optional backing-format extension), and either a Write patch for the path string if it fits in the existing slot or a request to relocate the path to a fresh cluster (in which case the planner falls back to safe-mode-style allocation; the only difference is no data copy happens). The header is rewritten last by the guest, not by the planner.
vmdk: a Write patch for the descriptor region (sector 1, length desc_size_sectors * 512), with the descriptor text re-emitted via create's helper. The header itself does not change.
For safe mode the planner produces a Qcow2RebaseOutput::Safe { context, header_patch } or VmdkRebaseOutput::Safe { context, descriptor_patch }:
RebaseQcow2SafeContext<'a> carries the overlay's cluster size, the cluster count, the refcount layout (refcount-table offset, refcount-bits width, where the free-cluster scan should start, which refcount blocks already exist), and a copy of the refcount-block bytes in scratch (the guest will mutate them as it allocates). Plus a small AllocationState struct the guest threads through allocate_overlay_cluster calls.
RebaseVmdkSafeContext<'a> carries the grain directory bytes and a similar AllocationState.
The header_patch / descriptor_patch is the final metadata rewrite the guest applies after the comparison loop completes.
Pure allocation helpers live in the crate:
allocate_overlay_cluster_qcow2(context: &mut RebaseQcow2SafeContext, state: &mut AllocationState) -> Result<u64, RebaseError> — returns the host-byte offset of a freshly claimed cluster, mutates the refcount-block bytes in context to bump the refcount from 0 to 1, mutates state to remember where the scan should continue next time. Pure: no I/O, no side-effects outside the supplied buffers.
allocate_overlay_grain_vmdk(...) — analogous for vmdk's grain table.
overlay_has_cluster_qcow2(l2_entry_bytes: &[u8], extended_l2: bool) -> bool — pure decoder; helps the guest decide whether to skip a cluster.
Unit and integration tests under src/crates/rebase/tests/ cover, at minimum:
qcow2 unsafe-mode rebase: build a small qcow2 image via create::plan_qcow2, rebase it onto a different backing path, apply the patches, re-parse, assert the new backing reference is in place.
qcow2 unsafe-mode rebase with a longer new path that forces relocation to a fresh cluster.
qcow2 safe-mode rebase smoke: plan against a known overlay+chain shape, assert the context's claims (cluster count, allocation scan start) match the overlay metadata.
qcow2 safe-mode allocator: hand-craft a refcount block with two free entries, allocate two clusters in sequence, assert offsets and refcount-block bytes are correct, assert a third call returns RefcountExhausted.
vmdk unsafe-mode rebase: build a monolithicSparse image via create::plan_vmdk, rebase the backing, assert descriptor lines are correct.
Error paths: incompatible virtual sizes (NewBackingIncompatible), oversized backing path (BackingPathTooLong), qcow2 with external data file (ExternalDataFile).
make instar, make lint, make test-rust, make check-binary-sizes, and pre-commit run --all-files all pass.

Nothing in phase 2 changes user-visible behaviour. The crate is consumed only by phase 3 (the rebase guest binary) and phase 10 (the fuzz harness).

Open questions¶

1. Unified entry point per format, or split unsafe vs safe?¶

Working choice: unified per format, dispatch by mode field in opts. Mirrors how resize collapses grow + shrink + noop into one plan_resize_qcow2 entry. Reduces the public surface the guest binary has to wire up.

The dispatching looks like:

pub fn plan_rebase_qcow2<'a>(
    opts: &Qcow2RebaseOpts<'_>,
    scratch: &'a mut [u8],
) -> Result<Qcow2RebaseOutput<'a>, RebaseError> {
    if opts.flags & FLAG_UNSAFE != 0 {
        plan_qcow2_unsafe(opts, scratch).map(Qcow2RebaseOutput::Unsafe)
    } else {
        plan_qcow2_safe(opts, scratch).map(Qcow2RebaseOutput::Safe)
    }
}

The internal plan_qcow2_unsafe / plan_qcow2_safe are pub(crate) so unit tests can reach them directly.

2. Output shape: enum or single struct with optional context?¶

Working choice: enum, with Unsafe carrying a RebasePlan ready to apply and Safe carrying a context plus a deferred-apply metadata patch:

pub enum Qcow2RebaseOutput<'a> {
    Unsafe {
        plan: RebasePlan<'a>,
    },
    Safe {
        context: RebaseQcow2SafeContext<'a>,
        // Header rewrite the guest applies after the
        // comparison loop completes. Kept separate from
        // `context` because it is the *last* thing the
        // guest writes; the allocator may also append
        // small refcount-block patches as it goes.
        header_patch: RebasePatch<'a>,
    },
}

An enum makes the two-mode contract explicit at compile time. The downside is the guest binary needs a match; the alternative (a single struct with an Option<Context>) hides the contract in runtime checks.

3. Path-relocation policy when the new path is longer¶

When the new backing path is longer than the slot the old path occupied, qemu-img relocates the path string to a fresh cluster and updates the header pointer. We follow the same approach:

If new_backing_path_len <= old_backing_file_size (the slot capacity that was reserved with the original path): rewrite in place at the existing backing_file_offset. This is the common case; even a moderately shorter path still fits.
Else, allocate a fresh cluster via the same allocate_overlay_cluster_qcow2 helper used in safe mode, write the new path there, and update backing_file_offset to point at it. The old slot becomes leaked bytes; instar check reports it as uninteresting (refcount 0). qemu-img check -r can reclaim it later.

This means unsafe mode can also allocate clusters, which slightly broadens the "no data writes" guarantee — but the only thing it writes is the new path string, which is bytes the user explicitly named. Confirm: this is fine.

4. Backing-format extension handling¶

QCOW2 v3 carries the backing format in a header extension (type = 0xE2792ACA). Rebase must:

If the user passed -F BACKING_FMT, encode it as that extension; if the existing header had an extension of this type, overwrite or rewrite the extension block to match.
If the user did not pass -F, leave the existing extension untouched. This means rebase preserves the hint when only the path is changing.
If the new backing path is empty (FLAG_DETACH), also remove the extension if present.

Working draft: the planner takes an opts.new_backing_format: Option<BackingFormat> (None = leave unchanged) and emits a separate patch for the extension block when needed. The planner is responsible for the byte layout; qcow2 parsing already has EXT_BACKING_FORMAT constants but not yet a writer — phase 2 adds the writer to either crates/qcow2/ (preferred — keeps format knowledge in the format crate) or crates/rebase/ (acceptable fallback).

5. Allocator failure mode¶

The safe-mode allocator scans for refcount entries == 0. If every existing refcount block is full, the allocator needs to append a new refcount block. That is the same logic resize phase 7 already implemented for grow (see src/crates/resize/src/qcow2.rs plan_l1_and_refcount_grow).

Working choice: defer refcount-block extension to a phase 2 follow-up. v1 of the safe-mode allocator returns RefcountExhausted when the existing blocks are full. The guest binary surfaces this as RebaseResult::ERROR_REFCOUNT_EXHAUSTED (append a new error code in phase 3) and the user reruns with -u or runs qemu-img rebase for now. This bound is large in practice (a 64 GB qcow2 with default cluster size has ~16k clusters worth of refcount entries, of which ~16k must become free for the allocator to exhaust — unrealistic for a typical rebase).

If integration testing shows this bound is too tight in practice, lift the deferral and bring plan_l1_and_refcount_grow's refcount-block-append logic into the rebase crate.

6. How does the guest "iterate guest clusters" in safe¶

mode?

Not a phase 2 concern — that lives in phase 3. But the planner's RebaseQcow2SafeContext must expose enough information that the guest can do it efficiently. Minimum fields:

overlay_cluster_count: u64 — total guest clusters to iterate (overlay.virtual_size / cluster_size).
overlay_l1_table_offset: u64, overlay_l1_table_size: u32 — so the guest can decode L2 pointers per guest cluster.
old_chain_first_input_idx, old_chain_input_count (from RebaseConfig) — for chain-reads against the old chain.
new_chain_first_input_idx, new_chain_input_count — for chain-reads against the new chain.
A pointer into scratch where the refcount-block bytes live (the allocator mutates them in place; the guest flushes them via Write patches once the comparison loop completes).

7. Should `RebasePatch` be a copy of `ResizePatch` or a¶

type alias?

Working choice: separate copy. Resize's ResizePatch includes a ZeroFill variant that rebase will not emit (qcow2 backing-path slots are written, not zeroed). Phase 2 defines a minimal RebasePatch with Write and Append only. If phase 6 (commit planners) finds it needs ZeroFill for the overlay-clear pass, it can add the variant then. Either way, no pub use resize::ResizePatch.

Execution¶

The phase plan recommends seven steps. Each step is small enough to review independently; consolidating into one commit at the end is also fine. The step table below is for sub-agent assignment.

Step	Effort	Model	Isolation	Brief for sub-agent
2a	medium	sonnet	none	Shipped as `6395d97`. Scaffold `src/crates/rebase/`: `Cargo.toml` declaring no-std with path-deps on `shared`, `qcow2`, `vmdk`, `create`; `src/lib.rs` with crate-level `#![no_std]`, `#![allow(clippy::too_many_arguments)]`, the public types (`RebasePatch<'a>`, `RebasePlan<'a>` with `MAX_REBASE_PATCHES = 64`, `RebaseError` enum, `RebaseMode { Unsafe, Safe }`), and stub entry points `plan_rebase_qcow2` and `plan_rebase_vmdk` that return `RebaseError::UnsupportedFormat`. Add the crate to the workspace members list in `src/Cargo.toml`. Mirror the `src/crates/resize/Cargo.toml` layout exactly. After this step `make instar` builds clean and clippy is silent.
2b	high	opus	none	Shipped as `0e4c4b9` (with step 2c). Implement qcow2 unsafe-mode planner in `src/crates/rebase/src/qcow2.rs` (new private module). Public-to-crate function `plan_qcow2_unsafe(opts, scratch) -> Result<RebasePlan, RebaseError>`. Computes: (1) validation — refuse external-data-file qcow2 with `ERROR_EXTERNAL_DATA_FILE`, refuse if `new_backing_path_len > backing_file_size_max` (1024), refuse on `OverlayCorrupt` if `QcowHeader::parse` returns None; (2) header rewrite bytes — `backing_file_offset` (u64 BE) and `backing_file_size` (u32 BE) at header offsets 8 and 16; (3) the path string at the existing `backing_file_offset` slot if `new_len <= old_size`, else allocate via the qcow2 allocator from step 2c (which is the same allocator used in safe mode) and write at the new offset; (4) optional backing-format extension — see open question 4. Emit patches into the `RebasePlan` in the order the guest must apply them: refcount + L2 + path string first, header field rewrite last. Caveat: long-path relocation deferred — both modes reject with `BackingPathTooLong` when the new path doesn't fit the existing slot. Backing-format extension rewrite also deferred.
2c	high	opus	none	Shipped as `0e4c4b9`. Implement qcow2 safe-mode planner + allocator in `src/crates/rebase/src/qcow2.rs`. Adds `RebaseQcow2SafeContext<'a>`, `AllocationState`, `plan_qcow2_safe`, and `allocate_overlay_cluster_qcow2`. Caveat: v1 supports `refcount_bits == 16` only (qemu-img's default); 1/2/4/8/32/64-bit widths return `UnsupportedFormat`. The bit-packing reference for the future widths is `qcow2::lookup_refcount` in `src/crates/qcow2/src/lib.rs:2980`.
2d	medium	sonnet	none	Shipped as `54caf37`. Implement vmdk unsafe-mode planner in `src/crates/rebase/src/vmdk.rs` (new private module). Public-to-crate function `plan_vmdk_unsafe(opts, scratch) -> Result<RebasePlan, RebaseError>`. Implements a descriptor rewriter that scans the existing descriptor line-by-line and substitutes `parentCID=` and `parentFileNameHint=` lines, preserving everything else; this avoids depending on `create::build_vmdk_descriptor_with_backing` (which would clobber the existing extent line and createType). Detach emits `parentCID=ffffffff` and an empty `parentFileNameHint=""` line.
2e	high	opus	none	Shipped. Implement vmdk safe-mode planner + grain allocator in `src/crates/rebase/src/vmdk.rs`. `RebaseVmdkSafeContext<'a>` carries the staged grain-directory bytes, the concatenated grain-table bytes (one block per allocated GT), the per-GT host sector offsets, and a per-GT dirty bitmap. `allocate_overlay_grain_vmdk(ctx, state)` bumps a `next_grain_sector` cursor by `overlay_grain_size_sectors` and returns the host byte offset of a freshly claimed grain; the caller (the guest's per-grain comparison loop) writes the data, updates the matching GTE in `grain_tables`, and marks the containing GT dirty. v1 only allocates grains into already-allocated GTs — the GD-extension follow-up (allocating a fresh GT when GDE == 0) is tracked under "Future work created by this phase". The unsafe-mode `VmdkRebaseOpts` callers get an `unsafe_only(...)` constructor that zeros the safe-mode-only fields.
2f	medium	sonnet	none	Shipped. Cross-format integration tests under `src/crates/rebase/tests/`. Four test files plus a shared `tests/common/mod.rs` helper: `qcow2_unsafe.rs` (basic in-place rebase, detach, and long-path rejection — the v1 planner refuses relocation), `qcow2_safe.rs` (smoke: context geometry matches the overlay; allocator: two sequential claims advance the host-offset cursor), `vmdk_unsafe.rs` (descriptor rewrite and detach round-trip), and `vmdk_safe.rs` (smoke + allocator landing at EOF). Each builds the starting image via `create::plan_*`, materialises bytes, runs the planner, applies the patches, and re-parses with the format crate's header parser.
2g	low	sonnet	none	Complete. `pre-commit run --all-files` passes (rustfmt + clippy + binary-size + GitHub Actions + shellcheck). Phase 2 rows in the master plan and this phase plan reflect step 2e and 2f shipping; remaining scope reductions (long-path relocation, non-16-bit refcount widths, backing-format extension writer, vmdk GD extension) are tracked under "Future work created by this phase".

Agent guidance¶

Execution model¶

Same model as phase 1: implementation work runs in the management session unless explicitly delegated. The model guidance in the step table reflects what a sub-agent would need if this work were delegated; the management session should also use opus when working on steps 2b, 2c, 2e because the cross-format reasoning load is real even when the operator is doing the typing.

Planning effort¶

The master plan flagged this phase as high effort. The high-effort steps within the phase are 2b, 2c, 2e. Steps 2a, 2d, 2f, 2g are medium-low.

Step ordering¶

Steps 2a → 2c → 2b → 2d → 2e → 2f → 2g is the dependency order. 2b depends on the allocator landing in 2c because unsafe-mode-with-long-path needs the same allocator safe mode uses. If the operator prefers the simpler "2b first, with TODO for relocation, then 2c, then come back to 2b", that is acceptable but produces an interim commit that fails the "long path" integration test in 2f.

Management session review checklist¶

After each step:

The files that were supposed to change actually changed (read them).
No unrelated files modified.
The new crate compiles in isolation (cargo build -p rebase via the lint container or pre-commit).
make instar builds, make lint is clean.
make test-rust passes (and the new tests are actually exercised, not silently skipped).
make check-binary-sizes unchanged.
pre-commit run --all-files clean.
No pub use from rebase re-exports anything that should stay private to qcow2 / vmdk / create. Promote a pub(crate) to pub in the format crate if needed; do not work around visibility by copying.
Refcount width semantics (1, 2, 4, 8, 16, 32, 64 bits) have at least one test each in step 2c's allocator tests, or the test brief documents which widths are out of scope and why.

Administration and logistics¶

Success criteria¶

Phase 2 is complete when:

src/crates/rebase/ exists and is wired into the workspace.
The public surface from the Mission section is implemented.
Integration tests from the Mission section pass.
make instar, make lint, make test-rust, make check-binary-sizes, pre-commit run --all-files all pass.
The execution-table row for phase 2 in PLAN-rebase-commit.md is marked Complete with the shipping commit hash.

Future work created by this phase¶

Refcount-block extension in safe-mode rebase (open question 5). v1 returns RefcountExhausted when existing blocks fill up. If the bound is too tight in practice, fold the resize-phase-7 refcount-block-append logic into the rebase allocator.
Subcluster-level rebase for extended L2. v1 treats extended L2 as "fully allocated" same as resize does; subcluster-granularity rebase would let the planner copy only the subclusters that diverged between chains. Out of scope until extended-L2 rebase is asked for.
Backing-format extension writer in qcow2 crate (open question 4). If step 2b puts the writer in the rebase crate, file a follow-up to migrate it to src/crates/qcow2/ so commit and any future operation can reuse it.
vmdk twoGbMaxExtent rebase. v1 only supports monolithicSparse on the overlay; rebase of a twoGbMaxExtent overlay is rejected with UnsupportedSubformat. Track as a vmdk-specific follow-up alongside the create-side twoGbMaxExtent output gap from PLAN-create's Future work.
vmdk safe-mode GD extension. The step 2e allocator only fills GTEs in already-allocated GTs. When the guest needs to allocate a grain whose GD entry is zero (i.e. the covering GT itself does not exist), it must first allocate a fresh GT, write a 512-GTE zero block at the new sector, and bump the GD entry — then set gd_dirty[0] so the host flushes the GD. Until that follow-up lands, the guest is expected to fall back to -u (unsafe) mode for overlays whose pre-existing GD coverage is incomplete.

Bugs fixed during this work¶

To be filled in as work progresses.

Documentation index maintenance¶

This is a phase plan, not a master plan. Not added to docs/plans/order.yml.

Back brief¶

Before executing any step of this plan, please back brief the operator as to your understanding of the plan and how the work you intend to do aligns with that plan.

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