I think he's going for this:
ら, as in たら - conditional
り, as in たり - kind of an etc. for verbs. Also, I think it was the ancient past tense.
る - plain/dictionary form
れ, as in れば - conditional
But that's just my guess. If it is ancient Japanese, then I can't help. If not, then I think that this list is a not-so-good way of showing these things.