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Proof step 919 from proof bitsand-cast (previous step)

mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits, bits1))), bits3 + bits = [], bits1 = [], bits1.first

User applied rule insert equation

And obtained the following new goals

Proof step 920:
# bits = # mklist(true, # bits1) ⊦ bits = lastn(# mklist(true, # bits1), fillsgn(# mklist(true, # bits1), bitsand(bits, mklist(true, # bits1)))), bits3 + bits = [], mklist(true, # bits1) = [], mklist(true, # bits1).first

Rule argument

pos: left 1 flags: rotate, discard

Proof step 919 from proof bitsand-cast (previous step)

User applied rule insert equation

And obtained the following new goals

Rule argument

Additional information