I don't understand this one either

This game is a pain, so don't sweat it if it leaves you scratching your head a bit.


Here's the setup:

G, O, P, R, Y

Rule 1: (G + P) x1 *exactly*
Rule 2: R x2 *exactly*
Rule 3: Y --> ~G, ~O
Rule 4: ~P --> O

CPos 3: (O or G) --> ~Y
CPos 4: ~O --> P

Rule 3 + CPos 4: Y --> ~O --> P

___ ___ ___ ___
P/O
___ ___ ___ ___
P/O
___ ___ ___ ___
P/O



Now for the question:

The Stem Rule says NO window has (O + R).

Okay, so now we have (R + P)x2. This is because we must have either an O or a P in each window (Rule 4), and because we must have R x2.
So we can only have one window with O, and we must have at least two with P.


Let's update our Model:

P R ___ ___

P R ___ ___

O ___ ___ ___



Y can't go with O, so let's stick in one of the other windows (they're the same, so just pick one).

P R Y ___

P R ___ ___

O ___ ___ ___



But we still haven't taken care of Rule 1. When we do that, we get two scenarios:

Scenario 1:

P R Y ___

P R ___ ___

O G P ___



Scenario 2:

P R Y ___

P R G ___

O G? P? ___




Q 13:
(A) No.
(B) No.
(C) No.
(D) No.
(E) This is our top row. No need to spend a whole lotto time looking over the other choices.