#!/usr/bin/env python

import sys

from the_semantic_db_code import *
from the_semantic_db_functions import *
from the_semantic_db_processor import *

C = context_list("read letters play")

x = ket("letter: f") + ket("letter: r") + ket("letter: o") + ket("letter: g")
y = ket("word: frog") + ket("letter: s")


def read_letters(one):
  def extract_letters(x):
    if x.startswith("letter: "):
      return x[8:]
    if x.startswith("word: "):
      return x[6:]
    return ""

  w = "".join(extract_letters(x.label) for x in one.data)
  if len(w) == 0:
    return ket("",0)
  return ket("word: " + w)

print("x:",x)
print("result:",read_letters(x))

print("y:",y)
print("result:",read_letters(y))