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A) w contains at least two 1's, and there is some s [less than or equal to] |w| such that w is a substring of the periodic bi-infinite sequence
They are closed, shift invariant subspaces of the space of bi-infinite sequences over some alphabet, usually assumed to be finite.
Actually, we have classified exactly the real numbers that can appear as the topological entropy of a subshift of the full shift of all binary bi-infinite sequences with co-c.