LabelModule
The terms of the labels (module label): an argument labelled IN, OUT or UND is in(Argument), out(Argument) or und(Argument), by its identifier inId(Id), outId(Id) or undId(Id) (the native labellings), and a statement statIn(Statement), statOut(Statement) or statUnd(Statement). A label is in, out or und. Kotlin builds them through LabelTerm.argument, LabelTerm.identifier and LabelTerm.statement.