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    Debug examples
    a. definition of distance
    b. beginword can be in dict
    c. endword may not be in dict at all.

    1. problem-solving skill
      In finding one-letter-diff word ,which is neighbor
      try not to iterate hash_table to delete elements. Think this way, why we need to iterate ? first may be to find something, second may be to update entry. We can make use of constant search ability of hash_table

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