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Proof step 5 from proof sel-fst (previous step)

⊦ decode(decode(encode(encode(encode(i), encode(j)))).1) = i

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: dec-nat: ⊦ decode(encode(n)) = n;%dec-int: ⊦ decode(encode(i)) = i;% ⊦ encode(m, n).1 = m; (s)