Create a function that takes an array of integers and returns all pairs of integers that have a difference of two. The resulting array should be sorted in ascending order of values.

Examples

difference_two([1, 2, 3, 4]) ➞ [[1, 3], [2, 4]]

difference_two([1, 23, 3, 4, 7]) ➞ [[1, 3]]

difference_two([4, 3, 1, 5, 6]) ➞ [[1, 3], [3, 5], [4, 6]]

Notes

Assume there are no duplicate integers in the array. The order of the integers in the input array should not matter.