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At: extension lemma 1

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

a(x) = a'(x)

By: Analyze 3

Generated subgoal:

13. a'a = a
4. x: Var
5. a(x) = 3
a(x) = a'(x)


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