Completely Empty

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

inis 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...

You should be an authorized user in order to see the full description and start solving this mission.