# CPD exclusions for intentional structural duplication:
# - hash: algorithmic duplication across SHA-256, SHA-512, MD5, etc. and between File/syscall I/O paths
# - hash binaries: fsha*sum.rs, fmd5sum.rs, fb2sum.rs share identical hash/check/verify dispatch
# - cp/dd: shared raw-syscall I/O patterns (splice, copy_file_range, sendfile fallback chains)
# - head: dual read path (buffered vs raw) with similar structure
# - wc: SIMD and scalar counting paths with parallel structure
# - cat: similar buffered/unbuffered output paths
# - fold: ASCII fast path and byte-mode path share structural patterns
# - tail: sendfile + backward-scan patterns shared with head/cat
# - fsum: SysV checksum helper functions share structural patterns
# - ftee: raw fd I/O write error handling shares structure with dd/cp
# - fod: format dispatch and option parsing share structural patterns
# - fsplit: output file management shares patterns with tee/shuf
# - fshuf: shuffle + output paths share structure with split
# - tests: natural structural similarity across test scenarios