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Proof step 8 from proof return (previous step)

⊦ flatten(val ++ return(val0, ty)) = flatten(val) ++ return(val0, ty)

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 2:
is_valuelist(val) ⊦ flatten(val ++ return(val0, ty)) = flatten(val) ++ return(val0, ty)
Proof step 7:
⊦ is_valuelist(val), flatten(val ++ return(val0, ty)) = flatten(val) ++ return(val0, ty)

Rule argument

[fma-arg: is_valuelist(val)]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRAFMAS : (is_valuelist(val))]]