[DO NOT MERGE; EOF] Draft of some experiments with libevmasm optimizer for EOF #15921

ekpyron · 2025-03-11T04:52:46Z

This is NOT anywhere near ready for actual merging. I just played around with this as a proof of concept for bringing back most libevmasm optimizers at least in a very simple and limited fashion (like deduplicating only reverting code paths within the same code section; constant optimization without using codecopy etc).

The more significant ones, the low-level inliner and the CSE would require even more doing.

But it gives us a lower bound for an estimate of how much savings we can still expect - this is what I get on top of the current EOF implementation with this draft (apart from a hand full of tests that start failing due to validation errors):
Notably, it's double digit percentage points for ERC20 contracts in our test suite; 5% for the deposit contract; etc.

We should emphasize this with our upcoming release (the final optimal version will even supersede these numbers by quite a bit).

Note that this is savings on top of the base-line unoptimized EOF savings, which will already be in the release (despite occasional code size regressions).

Change with these optimizations on top of the current EOF implementation:

Click for a table of gas differences

File name	IR optimized	Legacy optimized	Legacy
`array/dynamic_arrays_in_storage.sol`	+0%
`array/copying/array_of_struct_calldata_to_storage.sol`	+0%
`array/copying/array_of_struct_memory_to_storage.sol`	+0%
`array/copying/array_of_structs_containing_arrays_memory_to_storage.sol`	+0%
`array/dynamic_multi_array_cleanup.sol`	+0%
`storageLayoutSpecifier/delete.sol`	+0%
`array/copying/array_copy_target_simple.sol`	+0%
`array/nested_calldata_storage2.sol`	+0%
`various/different_call_type_transient.sol`	-0%
`inlineAssembly/transient_storage_low_level_calls.sol`	-0%
`array/copying/array_copy_storage_storage_dyn_dyn.sol`	-0%
`storageLayoutSpecifier/multiple_inheritance.sol`	-0%
`storageLayoutSpecifier/state_variable_mapping.sol`	-0%
`array/copying/array_copy_storage_storage_static_static.sol`	-0%
`structs/struct_copy_via_local.sol`	-0%
`storageLayoutSpecifier/state_variable_dynamic_array.sol`	-0%
`structs/struct_copy.sol`	-0%
`array/copying/copy_removes_bytes_data.sol`	-0%
`array/copying/bytes_inside_mappings.sol`	-0%
`array/nested_calldata_storage.sol`	-0%
`array/copying/calldata_array_dynamic_to_storage.sol`	-0%
`array/copying/array_copy_storage_storage_static_dynamic.sol`	-0%
`calldata/copy_from_calldata_removes_bytes_data.sol`	-0%
`structs/struct_containing_bytes_copy_and_delete.sol`	-0%
`array/bytes_length_member.sol`	-0%
`various/skip_dynamic_types_for_structs.sol`	-0%
`abiEncodeDecode/abi_decode_simple_storage.sol`	-0%
`abiEncoderV2/calldata_overlapped_dynamic_arrays.sol`	-0%
`array/copying/array_copy_storage_storage_dynamic_dynamic.sol`	-0%
`array/copying/storage_memory_nested_bytes.sol`	-0%
`array/dynamic_array_cleanup.sol`	-0%
`structs/struct_memory_to_storage_function_ptr.sol`	-0%
`array/copying/array_copy_nested_array.sol`	-0%
`libraries/using_library_mappings_return.sol`	-0%
`array/copying/storage_memory_nested_struct.sol`	-0%
`storage/empty_nonempty_empty.sol`	-0%
`array/fixed_array_cleanup.sol`	-0%
`array/copying/array_copy_storage_to_memory_nested.sol`	-0%
`storage/packed_storage_structs_bytes.sol`	-0%
`structs/calldata/calldata_struct_with_nested_array_to_storage.sol`	-0%
`array/copying/copying_bytes_multiassign.sol`	-0%
`array/copying/array_copy_calldata_storage.sol`	-0%
`array/push/array_push.sol`	-0%
`abiEncoderV2/abi_encode_v2.sol`	-0%
`array/copying/array_copy_target_simple_2.sol`	-0%
`array/copying/array_copy_storage_storage_different_base.sol`	-0%
`array/copying/array_nested_calldata_to_storage.sol`	-0%
`array/copying/array_to_mapping.sol`	-0%
`abiEncoderV2/storage_array_encoding.sol`	-0%
`array/copying/storage_memory_nested_from_pointer.sol`	-0%
`array/copying/storage_memory_nested.sol`	-0%
`array/push/array_push_nested_from_calldata.sol`	-0%
`storageLayoutSpecifier/storage_reference_array.sol`	-0%
`abiEncoderV1/abi_decode_v2_storage.sol`	-0%
`viaYul/copy_struct_invalid_ir_bug.sol`	-0%
`events/event_dynamic_nested_array_storage_v2.sol`	-0%
`array/copying/nested_array_element_storage_to_storage.sol`	-0%
`structs/copy_substructures_from_mapping.sol`	-0%
`array/copying/array_of_function_external_storage_to_storage_dynamic_different_mutability.sol`	-0%
`array/copying/array_elements_to_mapping.sol`	-0%
`structs/copy_from_mapping.sol`	-0%
`array/push/nested_bytes_push.sol`	-0%
`array/copying/calldata_array_to_mapping.sol`	-0%
`types/mapping/copy_from_mapping_to_mapping.sol`	-0%
`array/copying/nested_array_of_structs_storage_to_storage.sol`	-0%
`structs/copy_to_mapping.sol`	-0%
`structs/copy_substructures_to_mapping.sol`	-0%
`array/copying/nested_dynamic_array_element_calldata_to_storage.sol`	-0%
`storageLayoutSpecifier/dynamic_array_storage_end.sol`	-0%
`structs/copy_struct_array_from_storage.sol`	-0%
`abiEncoderV1/struct/struct_storage_ptr.sol`	-0%
`array/copying/copy_byte_array_to_storage.sol`	-0%
`structs/struct_delete_storage_with_array.sol`	-0%
`array/copying/array_of_function_external_storage_to_storage_dynamic.sol`	-0%
`structs/memory_structs_nested_load.sol`	-0%
`array/push/array_push_struct_from_calldata.sol`	-0%
`array/copying/copy_byte_array_in_struct_to_storage.sol`	-0%
`array/copying/array_copy_including_array.sol`	-0%
`array/array_storage_index_access.sol`	-0%
`array/copying/elements_of_nested_array_of_structs_calldata_to_storage.sol`	-0%
`array/copying/array_of_structs_containing_arrays_calldata_to_storage.sol`	-0%
`array/copying/nested_array_of_structs_calldata_to_storage.sol`	-0%
`array/copying/array_copy_different_packing.sol`	-0%
`array/push/array_push_struct.sol`	-0%
`array/copying/elements_of_nested_array_of_structs_memory_to_storage.sol`	-0%
`array/copying/copy_function_internal_storage_array.sol`	-0%
`array/copying/array_nested_memory_to_storage.sol`	-0%
`various/destructuring_assignment.sol`	-0%
`events/event_dynamic_array_storage_v2.sol`	-0%
`events/event_dynamic_array_storage.sol`	-0%
`array/copying/array_copy_clear_storage.sol`	-0%
`array/pop/array_pop_array_transition.sol`	-0%
`functionCall/mapping_array_internal_argument.sol`	-0%
`array/copying/nested_array_of_structs_memory_to_storage.sol`	-0%
`array/arrays_complex_from_and_to_storage.sol`	-0%
`array/copying/array_copy_storage_storage_struct.sol`	-0%
`array/array_storage_index_zeroed_test.sol`	-0%
`array/copying/array_storage_multi_items_per_slot.sol`	-0%
`array/copying/array_copy_storage_storage_different_base_nested.sol`	-0%
`array/pop/byte_array_pop_masking_long.sol`	-0%
`storageLayoutSpecifier/mapping_storage_end.sol`	-0%
`array/array_storage_push_empty.sol`	-0%
`array/array_storage_push_pop.sol`	-0%
`array/copying/memory_dyn_2d_bytes_to_storage.sol`	-0%
`array/copying/array_copy_cleanup_uint40.sol`	-0%
`structs/conversion/recursive_storage_memory.sol`	-0%
`externalContracts/snark.sol`	-0%
`libraries/internal_types_in_library.sol`	-1%
`array/push/push_no_args_2d.sol`	-1%
`array/pop/array_pop_uint24_transition.sol`	-1%
`errors/small_error_optimization.sol`	-1%
`various/eof/create_calldata.sol`	-1%
`events/event_indexed_string.sol`	-1%
`array/copying/storage_memory_packed_dyn.sol`	-1%
`array/pop/array_pop_uint16_transition.sol`	-1%
`array/pop/byte_array_pop_long_storage_empty_garbage_ref.sol`	-1%
`array/delete/bytes_delete_element.sol`	-1%
`array/reusing_memory.sol`	-1%
`constructor/bytes_in_constructors_unpacker.sol`	-1%
`array/copying/bytes_storage_to_storage.sol`	-1%
`saltedCreate/eof/salted_create_with_value.sol`	-1%
`array/push/push_no_args_bytes.sol`	-1%
`abiEncoderV2/abi_encode_calldata_slice.sol`	-1%
`abiEncoderV1/abi_encode_calldata_slice.sol`	-1%
`constructor/arrays_in_constructors.sol`	-2%
`array/push/byte_array_push_transition.sol`	-2%
`array/byte_array_transitional_2.sol`	-2%
`array/pop/byte_array_pop_long_storage_empty.sol`	-2%
`immutable/multi_creation.sol`	-2%
`functionCall/creation_function_call_with_salt.sol`	-2%
`functionCall/creation_function_call_with_args.sol`	-2%
`constructor/constructor_static_array_argument.sol`	-2%
`array/constant_var_as_array_length.sol`	-2%
`various/senders_balance.sol`	-2%
`array/copying/cleanup_during_multi_element_per_slot_copy.sol`	-2%
`constructor/bytes_in_constructors_packer.sol`	-2%
`immutable/immutable_tag_too_large_bug.sol`	-3%
`operators/userDefined/operator_making_view_external_call.sol`	-3%
`operators/userDefined/operator_making_pure_external_call.sol`	-3%
`inheritance/inherited_function_calldata_memory_interface.sol`	-3%
`inheritance/value_for_constructor.sol`	-4%
`cleanup/byte_array_to_storage_cleanup.sol`	-4%
`abiEncoderV2/abi_encode_v2_in_function_inherited_in_v1_contract.sol`	-4%
`externalContracts/strings.sol`	-5%
`externalContracts/deposit_contract.sol`	-5%
`functionCall/eof/external_call_to_nonexisting.sol`	-5%
`externalContracts/base64.sol`	-5%
`externalContracts/prbmath_unsigned.sol`	-5%
`array/fixed_arrays_as_return_type.sol`	-6%
`externalContracts/prbmath_signed.sol`	-6%
`externalContracts/FixedFeeRegistrar.sol`	-7%
`array/function_array_cross_calls.sol`	-8%
`functionCall/failed_create.sol`	-8%
`inheritance/constructor_with_params_diamond_inheritance.sol`	-9%
`various/erc20.sol`	-11%
`array/create_memory_array.sol`	-12%
`userDefinedValueType/erc20.sol`	-12%
`externalContracts/ramanujan_pi.sol`	-21%

Below are the numbers in total that I'm seeing relative to legacy on develop (i.e. current legacy EVM compared to EOF plus these initial improved optimizations). That still has some regressions - I'd assume due to code size increases in artifically small test contracts due to the EOF header overhead (and lack of full deduplication even with this PR) - but other than that impressive improvements.

Click for a table of gas differences

File name	IR optimized	Legacy optimized	Legacy
`various/many_subassemblies.sol`	11%
`constructor/no_callvalue_check.sol`	9%
`abiEncoderV2/abi_encode_v2_in_function_inherited_in_v1_contract.sol`	5%
`immutable/multi_creation.sol`	4%
`inheritance/inherited_function_calldata_memory_interface.sol`	2%
`array/reusing_memory.sol`	2%
`libraries/internal_types_in_library.sol`	1%
`array/copying/array_storage_multi_items_per_slot.sol`	1%
`functionCall/mapping_array_internal_argument.sol`	+0%
`array/copying/array_of_struct_memory_to_storage.sol`	+0%
`constructor/bytes_in_constructors_packer.sol`	+0%
`structs/structs.sol`	+0%
`libraries/using_library_mappings_return.sol`	+0%
`structs/memory_structs_nested_load.sol`	+0%
`storageLayoutSpecifier/state_variable_mapping.sol`	+0%
`events/event_dynamic_array_storage_v2.sol`	+0%
`events/event_dynamic_array_storage.sol`	+0%
`constructor/arrays_in_constructors.sol`	+0%
`array/copying/array_copy_storage_storage_different_base_nested.sol`	+0%
`structs/struct_copy.sol`	+0%
`saltedCreate/salted_create.sol`	+0%
`inlineAssembly/transient_storage_low_level_calls.sol`	+0%
`various/eof/create_calldata.sol`
`saltedCreate/eof/salted_create_with_value.sol`
`inlineAssembly/tstore_hidden_staticcall.sol`	-0%
`various/different_call_type_transient.sol`	-0%
`various/staticcall_for_view_and_pure.sol`	-0%
`structs/struct_copy_via_local.sol`	-0%
`array/copying/array_copy_clear_storage.sol`	-0%
`storageLayoutSpecifier/multiple_inheritance.sol`	-0%
`various/swap_in_storage_overwrite.sol`	-0%
`structs/struct_memory_to_storage_function_ptr.sol`	-0%
`array/copying/array_copy_storage_storage_dynamic_dynamic.sol`	-0%
`array/push/array_push.sol`	-0%
`structs/struct_delete_storage_with_array.sol`	-0%
`array/fixed_array_cleanup.sol`	-0%
`array/copying/copy_removes_bytes_data.sol`	-0%
`array/nested_calldata_storage.sol`	-0%
`array/nested_calldata_storage2.sol`	-0%
`abiEncoderV1/struct/struct_storage_ptr.sol`	-0%
`array/copying/array_copy_target_simple.sol`	-0%
`storageLayoutSpecifier/state_variable_dynamic_array.sol`	-0%
`array/copying/array_copy_storage_storage_different_base.sol`	-0%
`array/copying/bytes_inside_mappings.sol`	-0%
`calldata/copy_from_calldata_removes_bytes_data.sol`	-0%
`array/copying/array_copy_target_simple_2.sol`	-0%
`structs/struct_containing_bytes_copy_and_delete.sol`	-0%
`array/copying/storage_memory_nested_from_pointer.sol`	-0%
`array/copying/storage_memory_nested.sol`	-0%
`storageLayoutSpecifier/delete.sol`	-0%
`abiEncoderV2/abi_encode_v2.sol`	-0%
`array/copying/array_copy_calldata_storage.sol`	-0%
`array/bytes_length_member.sol`	-0%
`array/copying/array_copy_storage_storage_static_dynamic.sol`	-0%
`events/event_dynamic_nested_array_storage_v2.sol`	-0%
`array/copying/array_copy_storage_storage_dyn_dyn.sol`	-0%
`storage/packed_storage_structs_bytes.sol`	-0%
`storage/empty_nonempty_empty.sol`	-0%
`array/push/array_push_struct.sol`	-0%
`structs/copy_struct_array_from_storage.sol`	-0%
`array/copying/nested_array_of_structs_storage_to_storage.sol`	-0%
`various/skip_dynamic_types_for_structs.sol`	-0%
`array/copying/calldata_array_dynamic_to_storage.sol`	-0%
`array/copying/array_of_function_external_storage_to_storage_dynamic_different_mutability.sol`	-0%
`storageLayoutSpecifier/mapping_storage_end.sol`	-0%
`structs/calldata/calldata_struct_with_nested_array_to_storage.sol`	-0%
`array/copying/array_copy_nested_array.sol`	-0%
`array/dynamic_array_cleanup.sol`	-0%
`array/copying/copying_bytes_multiassign.sol`	-0%
`array/copying/storage_memory_nested_bytes.sol`	-0%
`array/push/nested_bytes_push.sol`	-0%
`array/copying/nested_array_element_storage_to_storage.sol`	-0%
`abiEncoderV2/storage_array_encoding.sol`	-0%
`abiEncoderV2/calldata_overlapped_dynamic_arrays.sol`	-0%
`array/copying/array_nested_calldata_to_storage.sol`	-0%
`array/push/array_push_struct_from_calldata.sol`	-0%
`array/copying/array_of_function_external_storage_to_storage_dynamic.sol`	-0%
`array/copying/storage_memory_nested_struct.sol`	-0%
`array/invalid_encoding_for_storage_byte_array.sol`	-0%
`array/push/array_push_nested_from_calldata.sol`	-0%
`array/copying/array_copy_different_packing.sol`	-0%
`array/copying/array_copy_storage_storage_static_static.sol`	-0%
`array/copying/array_of_struct_calldata_to_storage.sol`	-0%
`array/copying/array_copy_storage_to_memory_nested.sol`	-0%
`array/copying/copy_function_internal_storage_array.sol`	-0%
`various/destructuring_assignment.sol`	-0%
`array/copying/array_copy_storage_storage_struct.sol`	-0%
`array/copying/array_nested_memory_to_storage.sol`	-0%
`abiEncodeDecode/abi_decode_simple_storage.sol`	-0%
`storageLayoutSpecifier/storage_reference_array.sol`	-0%
`abiEncoderV1/abi_decode_v2_storage.sol`	-0%
`viaYul/copy_struct_invalid_ir_bug.sol`	-1%
`array/copying/copy_byte_array_to_storage.sol`	-1%
`structs/copy_from_mapping.sol`	-1%
`array/copying/copy_byte_array_in_struct_to_storage.sol`	-1%
`array/pop/array_pop_array_transition.sol`	-1%
`structs/copy_substructures_from_mapping.sol`	-1%
`array/dynamic_multi_array_cleanup.sol`	-1%
`storageLayoutSpecifier/dynamic_array_storage_end.sol`	-1%
`structs/copy_substructures_to_mapping.sol`	-1%
`operators/userDefined/operator_making_view_external_call.sol`	-1%
`operators/userDefined/operator_making_pure_external_call.sol`	-1%
`array/copying/nested_dynamic_array_element_calldata_to_storage.sol`	-1%
`structs/copy_to_mapping.sol`	-1%
`types/mapping/copy_from_mapping_to_mapping.sol`	-1%
`array/copying/array_of_structs_containing_arrays_memory_to_storage.sol`	-1%
`libraries/using_library_mappings_public.sol`	-1%
`array/arrays_complex_from_and_to_storage.sol`	-1%
`errors/small_error_optimization.sol`	-1%
`array/copying/array_to_mapping.sol`	-1%
`array/copying/array_copy_cleanup_uint40.sol`	-1%
`array/array_storage_index_zeroed_test.sol`	-1%
`array/array_storage_index_access.sol`	-1%
`array/copying/array_of_structs_containing_arrays_calldata_to_storage.sol`	-1%
`array/copying/calldata_array_to_mapping.sol`	-1%
`array/copying/array_elements_to_mapping.sol`	-1%
`array/copying/elements_of_nested_array_of_structs_calldata_to_storage.sol`	-1%
`array/copying/nested_array_of_structs_calldata_to_storage.sol`	-1%
`array/copying/function_type_array_to_storage.sol`	-1%
`userDefinedValueType/calldata.sol`	-1%
`array/copying/array_copy_including_array.sol`	-1%
`array/copying/storage_memory_packed_dyn.sol`	-1%
`array/copying/elements_of_nested_array_of_structs_memory_to_storage.sol`	-2%
`array/copying/nested_array_of_structs_memory_to_storage.sol`	-2%
`externalContracts/ramanujan_pi.sol`	-2%
`array/pop/array_pop_uint24_transition.sol`	-3%
`array/function_array_cross_calls.sol`	-3%
`externalContracts/snark.sol`	-3%
`structs/conversion/recursive_storage_memory.sol`	-3%
`array/copying/memory_dyn_2d_bytes_to_storage.sol`	-3%
`array/array_storage_push_pop.sol`	-4%
`array/array_storage_push_empty.sol`	-4%
`array/pop/byte_array_pop_masking_long.sol`	-4%
`array/pop/array_pop_uint16_transition.sol`	-4%
`array/dynamic_arrays_in_storage.sol`	-4%
`array/fixed_arrays_as_return_type.sol`	-4%
`externalContracts/deposit_contract.sol`	-5%
`array/push/push_no_args_2d.sol`	-6%
`array/push/push_no_args_bytes.sol`	-6%
`array/delete/bytes_delete_element.sol`	-6%
`events/event_indexed_string.sol`	-6%
`array/pop/byte_array_pop_long_storage_empty_garbage_ref.sol`	-8%
`array/push/byte_array_push_transition.sol`	-9%
`array/byte_array_transitional_2.sol`	-9%
`externalContracts/FixedFeeRegistrar.sol`	-10%
`array/pop/byte_array_pop_long_storage_empty.sol`	-10%
`array/copying/cleanup_during_multi_element_per_slot_copy.sol`	-10%
`array/array_storage_index_boundary_test.sol`	-10%
`array/copying/bytes_storage_to_storage.sol`	-11%
`array/array_storage_length_access.sol`	-12%
`array/array_storage_push_empty_length_address.sol`	-12%
`userDefinedValueType/erc20.sol`	-14%
`externalContracts/prbmath_signed.sol`	-16%
`externalContracts/prbmath_unsigned.sol`	-16%
`various/erc20.sol`	-17%
`array/create_memory_array.sol`	-17%
`inheritance/value_for_constructor.sol`	-18%
`constructor/bytes_in_constructors_unpacker.sol`	-19%
`functionCall/creation_function_call_with_args.sol`	-20%
`functionCall/creation_function_call_with_salt.sol`	-20%
`constructor/constructor_static_array_argument.sol`	-20%
`cleanup/byte_array_to_storage_cleanup.sol`	-20%
`various/senders_balance.sol`	-21%
`functionCall/eof/external_call_to_nonexisting.sol`	-22%
`inheritance/constructor_with_params_diamond_inheritance.sol`	-22%
`storageLayoutSpecifier/constructor.sol`	-24%
`array/constant_var_as_array_length.sol`	-24%
`externalContracts/base64.sol`	-29%
`abiEncoderV2/abi_encode_calldata_slice.sol`	-34%
`abiEncoderV1/abi_encode_calldata_slice.sol`	-34%
`externalContracts/strings.sol`	-34%
`functionCall/failed_create.sol`	-38%
`immutable/immutable_tag_too_large_bug.sol`	-48%

…sts.

Looses one test case: semanticTests/array/invalid_encoding_for_storage_byte_array.sol

Looses another handful of tests. Needs to check for correctness (in some version one test expectation actually changed, i.e. it produced invalid output).

This, of course, comes with runtime gas cost regressions.

github-actions · 2025-03-26T12:06:37Z

This pull request is stale because it has been open for 14 days with no activity.
It will be closed in 7 days unless the stale label is removed.

github-actions · 2025-04-02T12:06:37Z

This pull request was closed due to a lack of activity for 7 days after it was stale.

ekpyron added 5 commits March 11, 2025 05:16

Hack isoltest to always enforce gas costs and update for EOFv1 gas co…

e6ac59a

…sts.

Poor man's deduplication and jumpdest removal.

4327823

Looses one test case: semanticTests/array/invalid_encoding_for_storage_byte_array.sol

Add some comments.

d49c223

Add back peephole optimizer.

ed76494

Looses another handful of tests. Needs to check for correctness (in some version one test expectation actually changed, i.e. it produced invalid output).

Bring back ConstantOptimizer without codecopy method.

1c5ce16

This, of course, comes with runtime gas cost regressions.

ekpyron changed the title ~~[DO NOT MERGE] Draft of some experiments with libevmasm optimizer for EOF~~ [DO NOT MERGE; EOF] Draft of some experiments with libevmasm optimizer for EOF Mar 11, 2025

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[DO NOT MERGE; EOF] Draft of some experiments with libevmasm optimizer for EOF #15921

[DO NOT MERGE; EOF] Draft of some experiments with libevmasm optimizer for EOF #15921

ekpyron commented Mar 11, 2025 •

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github-actions bot commented Mar 26, 2025

github-actions bot commented Apr 2, 2025

[DO NOT MERGE; EOF] Draft of some experiments with libevmasm optimizer for EOF #15921

[DO NOT MERGE; EOF] Draft of some experiments with libevmasm optimizer for EOF #15921

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ekpyron commented Mar 11, 2025 • edited Loading

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ekpyron commented Mar 11, 2025 •

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