| ⊦ flatten(val ++ shortval(sho)) = flatten(val) ++ shortval(sho) |
is_valuelist(val) ⊦ flatten(val ++ shortval(sho)) = flatten(val) ++ shortval(sho)
⊦ is_valuelist(val), flatten(val ++ shortval(sho)) = flatten(val) ++ shortval(sho)
[[CONCRETESIMPRULES : ()], [EXTRAFMAS : (is_valuelist(val))]]