@property<EOL><INDENT>def TENSES(self):<DEDENT>
a = set(TENSES[id] for id in self._format)<EOL>a = a.union(set(TENSES[id] for id in self._default.keys()))<EOL>a = a.union(set(TENSES[id] for id in self._default.values()))<EOL>a = sorted(x[:-<NUM_LIT:2>] for x in a if x[-<NUM_LIT:2>] is False) <EOL>return a<EOL>
Yields a list of tenses for this language, excluding negations.
            Each tense is a (tense, person, number, mood, aspect)-tuple.