def get_id(self, version: int) -> str:
    if self.array:
        id = 'da'
    else:
        id = 'dl'
    return (id + self.expr.get_id(version))
def get_id(self, version: int) -> str:
    if self.array:
        id = 'da'
    else:
        id = 'dl'
    return (id + self.expr.get_id(version))