Given three Int
s, one of them small, one medium, and one large, return true
if the three values are evenly
spaced: So the difference between small and medium is the same as the difference between medium and large.
For example, the values 2, 4, 6
and 6, 4, 2
, and 4, 6, 2
are all evenly spaced, but 4, 6, 3
are not.
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