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At: extension lemma


a,a':Assignment. a' extends a (x:Var. a(x) = 3 a(x) = a'(x))

By: UnivCD

Generated subgoal:

11. a: Assignment
2. a': Assignment
3. a' extends a
4. x: Var
5. a(x) = 3
a(x) = a'(x)


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allimpliesequalapply