sclass MultiShortArrayInputStream extends InputStream {
  Iterator<short[]> it;
  short[] buf;
  int iBuf;
  
  *(Iterable<short[]> l) { it = iterator(l); }
  
  public int read() {
    while (iBuf >= l(buf)*2)
      if (!it.hasNext()) ret -1;
      else { buf = it.next(); iBuf = 0; }
    short s = buf[iBuf/2];
    int i = (odd(iBuf) ? s >> 8 : s) & 0xFF;
    iBuf++;
    ret i;
  }
}