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F first and A third gives 70 words, and three quarters of them come down to just two consonants.
L takes about forty one percent of the box between them and R takes thirty four. Everything else shares the last quarter.
FLA and FRA are effectively the whole pattern. FLASH, FLAME and FLAGS take the first, FRAME, FRANK and FRAUD take the second.
That makes the opening decision unusually simple. One guess settles which door you came through, and the group halves immediately.
FEARS is the main entry outside those two doors, with a vowel in the second box instead of a consonant.
It is worth holding back rather than leading with, since the two blends between them account for so much more of the group.
FLASH, since L edges R by seven points. Both are good openers though, and whichever misses points you straight at the other branch.
No. FIELD puts I in the second box and E in the third. The A this pattern needs is not in the word at all.
Very few that you would recognise. Once both blends are ruled out the remaining options thin out quickly.