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Proof step 5 from proof lift-unknown (previous step)

(r ==>(o, a) * R)[rs, f, g] ⊦ ∃ a. (a[r =>_] * R)[rs, f, g]

User applied rule exists right

And obtained the following new goals

Rule argument

pos: right 1 terms: a abort: F discard: T computed: T

Additional information

Used terms: a