Your first quote is, as Paragon Graufalke mentioned earlier, referring to White Lotus Master Riposte (a Paragon tier feat that grants extra MBAs - that is, Melee Basic Attacks). The second quote looks like it might be a typo that is also referring to White Lotus Master Riposte (WLMR instead of MLMR). And from your original post, I'm guessing that MLP is a further corrupted typo abbreviation of White Lotus Master Riposte (Master Lotus Riposte). These are just guesses, though.