| ⊦ is_valuelist(val), flatten(val ++ break(stringvar .label)) = flatten(val) ++ break(stringvar .label) |
⊦ ¬ is_valuelist(val) → flatten(val) = val
⊦ flatten(val ++ break(stringvar .label)) = val ++ break(stringvar .label), is_valuelist(val)
[[CONCRETESIMPRULES : ()]]