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sclass SelectBot<A> extends Concept {
  new TreeMap<S, A> examples;
  new TreeMap<S, A> guessed;
  transient S lastMatch;
  
  void put(S s, A value) {
    examples.put(s, value);
    guessed.remove(s);
    change();
  }

  A get(S s) {
    lastMatch = guess(s);
    A value = mapGet(examples, lastMatch);
    if (neq(lastMatch, s))
      if (mapPutIfChange(guessed, s, value)) change();
    ret value;
  }
  
  S guess(S s) {
    ret levenClosestIC(examples, s);
  }
}