def handle_molecular_activity_default(_: str, __: int, tokens: ParseResults) -> ParseResults:
    """Handle a BEL 2.0 style molecular activity with BEL default names."""
    upgraded = language.activity_labels[tokens[0]]
    tokens[NAMESPACE] = BEL_DEFAULT_NAMESPACE
    tokens[NAME] = upgraded
    return tokens
Handle a BEL 2.0 style molecular activity with BEL default names.