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The set Formula is defined by
with constructors "T", "not", "and", "forall".
T in Formula forall x in Formula: not(x) in Formula, forall x in Formula, y in Formula: and(x, y) in Formula, forall x in Variable, y in Formula: forall(x, y) in Formula
An element of Formula is forall(X, and(T, or(T, F))) (assuming X in Variable).