code: def do_OP_WITHIN(vm):
      
      v3, v2, v1 = [vm.pop_int() for i in range(3)]
      ok = (v2 <= v1 < v3)
      vm.append(vm.bool_to_script_bytes(ok))
docs: >>> s = [b'b', b'a', b'c']
      >>> do_OP_WITHIN(s, False)
      >>> print(s == [b'\1'])
      True
      >>> s = [b'd', b'a', b'c']
      >>> do_OP_WITHIN(s, False)
      >>> print(s == [b''])
      True