@classmethod<EOL><INDENT>def _expand_alts_in_vcf_record_list(cls, vcf_records):<DEDENT>
new_vcf_records = []<EOL>for record in vcf_records:<EOL><INDENT>new_vcf_records.extend(record.to_record_per_alt())<EOL><DEDENT>return new_vcf_records<EOL>
Input: list of vcf_records. Returns new list, where
        any records with >ALT is replaced with one vcf record per ALT.
        This doesn't change FORMAT or INFO columns, which means they
        are now broken for those records