Actually, no there isn't.
All credit to the programmers who already did that work.
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clang #3 fasta program could be an example for a faster Swift program.
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deprecated Swift k-nucleotide program could be fixed.
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clang #9 reverse-complement program could be an example for a faster Swift program.
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clang regex-redux programs that use pcre or pcre2 could be examples for faster Swift programs.