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Existential 1 = ?Goal : [p : nat q := S p : nat n : nat m : nat |- ?y = m]
Existential 2 =
?y : [p : nat q := S p : nat n : nat m : nat |- nat] (p, q cannot be used)
Existential 3 = ?Goal0 : [q : nat n : nat m : nat |- n = ?y]
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