MIND→KGLB follows the pattern: each letter is replaced by the letter 2 positions before it (M-2=K, I-2=G, N-2=L, D-2=B). Similarly ARGUE→YPESC uses the same -2 shift. Applying this to DIAGRAM: D-2=B, I-2=G, A-2=Y, G-2=E, R-2=P, A-2=Y, M-2=K, giving BGYEPYK.