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Proof step 2 from proof remove-wbufs-at (previous step)

m < # lpt ⊦ lpt.mapIndices(ns, λ lp. lp.size:= LEB_SIZE)[m] = (m ∈ ns ⊃ lpt[m].size:= LEB_SIZE;lpt[m])

Heuristic if-then-else split applied rule case distinction

And obtained the following new goals

Proof step 3:
m < # lpt, m ∈ ns ⊦ lpt.mapIndices(ns, λ lp. lp.size:= LEB_SIZE)[m] = lpt[m].size:= LEB_SIZE
Proof step 6:
m < # lpt ⊦ lpt.mapIndices(ns, λ lp. lp.size:= LEB_SIZE)[m] = lpt[m], m ∈ ns

Rule argument

pos: right 1

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