A format for expressing an ordered list of integers is to use a comma separated list of either:
- individual integers
- a range of integers denoted by the starting integer separated from the end integer in the range by a dash,
- the range includes all integers in the interval including both endpoints. It is not considered a range unless it spans at least 3 numbers. For example
12, 13, 15-17
Complete the solution so that it takes a list of integers in increasing order and returns a correctly formatted string in the range format.
solution([-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20])
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