list method
Implementation
@override
String list(List<String> items, ListCombination combination) {
final (two, end) = switch (combination) {
ListCombination.conjunctiveShort => (' & ', ' & '),
ListCombination.conjunctiveLong => (' and ', ', and '),
ListCombination.disjunctive => (' or ', ', or '),
};
return RruleL10n.defaultList(items, two: two, end: end);
}