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Proof step 904 from proof bitsand-cast (previous step)

mklist(true, # bits1) = bits1, # bits0 < # bits1, false ∈ bits1 ⊦ bits2 + bits1 = [], bits0 = [], bits1 = [], lastn(# bits1, mklist(false, # bits1 - # bits0) + bits0) = lastn(# bits1, fillsgn(# bits1, bitsand(bits1, bits0))), bits0.first

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: rotate, discard

Additional information

Used simplifier rules: ⊦ mklist(boolvar, m) = [] ↔ m = 0;% ⊦ # bits = 0 ↔ bits = [];% ⊦ # mklist(boolvar, n) = n;% ⊦ ¬ false ∈ mklist(true, n);