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Proof step 9 from proof noval (previous step)

is_valuelist(val ++ noval) ⊦ flatten(val ++ noval) = flatten(val) ++ noval

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
⊦ flatten(val ++ noval) = flatten(val) ++ noval

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_valuelist(val ++ val0)])]]