private function validate(BoggleWord $word)
{
if ($word->getLength() < 3) {
throw new IllegalWordLengthException("Word should at least have 2 characters");
}
if ($this->words->contains($word)) {
throw new WordAlreadyEnteredException("Word was already entered before");
}
if (!$word->isPossibleInLayout($this->grid)) {
throw new WordNotPossibleException("Word is impossible to make");
}
if (!$this->dictionary->contains($word)) {
throw new WordNotInDictionaryException("Word doesn't exist in dictionary");
}
}
