code: def validate_type_ac_pair(type, ac):
      
  
      assert type in valid_pairs, "Unknown variant type " + type
      if valid_pairs[type].match(ac):
          return (ValidationLevel.VALID,
                  "Accession ({ac}) is compatible with variant type {type}".format(ac=ac, type=type))
      elif invalid_pairs[type].match(ac):
          return (ValidationLevel.ERROR,
                  "Accession ({ac}) is not compatible with variant type {type}".format(
                      ac=ac, type=type))
      else:
          return (ValidationLevel.WARNING,
                  "Accession ({ac}) is not known to be compatible with variant type {type}".format(
                      ac=ac, type=type))
docs: validate that accession is correct for variant type AND that
      accession is fully specified.