internal fun <T> interleave(
  a: Iterable<T>,
  b: Iterable<T>,
): List<T> {
  val ia = a.iterator()
  val ib = b.iterator()

  return buildList {
    while (ia.hasNext() || ib.hasNext()) {
      if (ia.hasNext()) {
        add(ia.next())
      }
      if (ib.hasNext()) {
        add(ib.next())
      }
    }
  }
}

// TODO check read only options for creating lists

16B37..16B3F  ; valid                  ;      ; NV8    # 7.0  PAHAWH HMONG SIGN VOS THOM..PAHAWH HMONG SIGN XYEEM FAIB
16B40..16B43  ; valid                                  # 7.0  PAHAWH HMONG SIGN VOS SEEV..PAHAWH HMONG SIGN IB YAM
16B44..16B45  ; valid                  ;      ; NV8    # 7.0  PAHAWH HMONG SIGN XAUS..PAHAWH HMONG SIGN CIM TSOV ROG
16B46..16B4F  ; disallowed                             # NA   <reserved-16B46>..<reserved-16B4F>