def add(self, alias, intervals, aliaseds, distances):
    assert (len(aliaseds) == len(distances))
    self[alias] = AliasedGroup(intervals, aliaseds, distances)
def add(self, alias, intervals, aliaseds, distances):
    assert (len(aliaseds) == len(distances))
    self[alias] = AliasedGroup(intervals, aliaseds, distances)