Group words by Shift degree

// Class name must be "Main"
// Libraries included:
// json simple, guava, apache commons lang3, junit, jmock

/**
  Input: ['abc', 'dog', 'grj', 'bcd', 'eph', 'def', 'apple']
  Output: [['abc', 'bcd', 'def'], ['dog', 'grj', 'eph'], ['apple']]

    ['abc', 'apple', 'bcd', 'def', 'dog', 'eph', 'grj']

    [abc]
    [apple]
    [bcd, def]

    ['abc', 'bcd', 'def', 'dog', 'eph', 'grj'], ['apple']

    b - a = 1
    c - b = 1
    abc - (1,1) - "1.1"
    bcd - (c - b) = 1, d - c = 1 -> "1.1"

{
    (1,1) : [abc, bcd..]

}
    abc, bcd
    ascci(a) - ascii(b) = 1
    ascci(b) - ascii(c) = 1
    ascci(c) - ascii(d) = 1


    ['abc', 'dog', 'grj', 'bcd', 'eph', 'def', 'apple']

 */


/**
  cnf - dog shifted -1
  dog
  eph - dog shifted +1
  fqi - dog shifted +2
  grj - dog shifted +3
 */