Problem 60261. Interval Compression

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Given a set of integers, the task is to create a list of closed intervals where each interval includes its endpoints. For example, the interval 1 to 5 includes each value 'x' that satisfies the condition 1 ≤ x ≤ 5.
Intervals can contain consecutive values if the difference between a value and the next smaller value in the set equals one. If this condition is not met, a new interval begins. The start value of an interval is excluded from this rule. A single value that does not fit into an existing interval becomes the start and endpoint of a new interval.
Input: An array of integers. 
Output: A matrix with two columns; each row containing two integers indicating the endpoints of the interval. The matrix should be sorted by the start point of each interval.
Examples:
create_intervals([1, 2, 3, 4, 5, 7, 8, 12]) returns [ 1, 5;  7, 8 ; 12, 12] create_intervals([1, 2, 3, 6, 7, 8, 4, 5]) returns [1, 8]