contextualize_sentence : CONTEXTUALIZE LPAREN contextualize_items RPAREN
                                  | CONTEXTUALIZE NUMBER LPAREN contextualize_items RPAREN

def p_contextualize_sentence(self, t):
        """contextualize_sentence : CONTEXTUALIZE LPAREN contextualize_items RPAREN
                                  | CONTEXTUALIZE NUMBER LPAREN contextualize_items RPAREN"""

        if len(t) == 5:
            t[0] = contextualize(t[3], line=t.lineno(1))
        else:
            t[0] = contextualize(t[4], t[2], line=t.lineno(1))