Create Intervals

**English**RU

From a set of ints you have to create a list of closed intervals as tuples, so the intervals are covering all the values found in the set.

A closed interval includes its endpoints! The interval *1..5*, for example,
includes each value *x* that satifies the condition
*1 <= x <= 5*.

Values can only be in the...

A single value, that does not fit into an existing interval becomes the start- and
endpoint of a new interval.

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