code: protected static List<String> getOriginalAlleles(String[] ori) {
          if (ori != null && ori.length == 4) {
              String[] multiAllele = ori[2].split(",");
              if (multiAllele.length != 1) {
                  ArrayList<String> alleles = new ArrayList<>(multiAllele.length + 1);
                  alleles.add(ori[1]);
                  alleles.addAll(Arrays.asList(multiAllele));
                  return alleles;
              } else {
                  return Arrays.asList(ori[1], ori[2]);
              }
          }
  
          return null;
      }
docs: Assumes that ori is in the form "POS:REF:ALT_0(,ALT_N)*:ALT_IDX".
  ALT_N is the n-th allele if this is the n-th variant resultant of a multiallelic vcf row
  
  @param ori
  @return