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Vcf-split splits a multi-sample VCF into single-sample VCFs, writing thousands
of output files simultaneously. Parsing the TOPMed human chromosome 1 BCF
with bcftools takes two days, so extracting the 137,977 samples one at a time
or using thousands of parallel readers of the same file is impractical.
Vcf-split solves this by generating thousands of single-sample outputs during
a single sweep through the multi-sample input.
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