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Python.
I tried the couples at first but some random tests were failing... even more confusing since the basic tests work for both couples and total bears :)
I think there is a problem in the definition:
"Return an array containing a string of only the mating pairs available
[...]
and true if the number is more than or equal to x, false if not"
THE number is vague and does not refer to anything. I find this particularly confusing because it would be intuitive to count the number of couples (as if it said "their number", referring to mating pairs), but the solution requires the total number of bears which are mating instead.
Confusing.