SPOILER ALERT: LAST LEVEL SOLUTION!!!
A; -E; O .
Why? I have no idea. I suck at math and my brains wok gramatically, so I proposed affirmatives that could make me reach the awnser. Here's how I did it.
G = The sky is blue
IF M = I know that THEREFORE G = The sky is blue AND A = I can see
THEREFORE A = I can see
IF M = I know that AND A = I can see THEN NOT E = I am blind (or: I am not blind)
THEREFORE NOT E = I am blind
IF O = All that I stated is logical AND V = Correct THEN NOT E = I am blind OR R = Stupid
THEREFORE O = All that I stated is correct
That's it, though the logic gets a bit limp at the end, I did it.