Create Intervals (generator version)

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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.

In this mission you should use the 'yield' to make your function a generator.

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 same interval...

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

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