"C'mon man, (?y.M)[x := N] ? ?y.(M[x := N]), if x ? y, provided y ? FV(N) is the process of replacing all free occurrences of V in the expression E with expression R." "Damn, thanks Barbie!" says Steven.

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Create your own!
      "C'mon man, (?y.M)[x := N] ? ?y.(M[x := N]), if x ? y, provided y ? FV(N) is the process of replacing all free occurrences of V in the expression E with expression R." "Damn, thanks Barbie!" says Steven.