Completely Empty Completely Empty
Elementary
English

You need to figure if a wellfounded and wellsized iterable is completely empty.

An iterable x0 is wellfounded if there is no infinite sequence

x1,x2,x3...
such that
... in x3 in x2 in x1 in x0
(where
in
is meant iteratively,
x(n+1)
will be encountered while iterating through
xn
).

A wellfounded iterable is wellsized if it has only finitely many iterable elements, and all of them are wellsized.

A wellfounded iterable is completely empty when all its elements are completely...

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