Based on previous feedback: The answer must exclude all of C, R, A, N, E, S, O, I, D, M, G, H, T, B, U, F; it must have L in the third position (from SOLID and BULLY), and must include at least two Y’s (as inferred from FLYBY’s two yellow Y’s). Among the limited allowed letters and considering that the only viable vowel is Y, one candidate is “XYLYL,” which meets the constraints: X _ Y L Y L, with L fixed at position three and Y’s in positions two and four. I choose XYLYL as the final guess.