| ⊦ flatten(val ++ charval(jchar)) = flatten(val) ++ charval(jchar) |
is_valuelist(val) ⊦ flatten(val ++ charval(jchar)) = flatten(val) ++ charval(jchar)
⊦ is_valuelist(val), flatten(val ++ charval(jchar)) = flatten(val) ++ charval(jchar)
[[CONCRETESIMPRULES : ()], [EXTRAFMAS : (is_valuelist(val))]]