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Eighteen words put F first and S third, and the U branch takes more than any other. Most of the page is built from short stems.
U takes the second box in seven of the eighteen, thirty nine percent. I follows on four and E on three. A and O take two each and that is the whole distribution.
FUSED, FUSES, FUSEE and FUSEL come off one stem inside that branch, so the U words narrow less than their count implies.
Five words repeat a letter, and FESSE, FOSSA, FOSSE and FUSSY carry a doubled S. If your puzzle shows a repeat, that small group is where to look first.
FISHY and FISTS are the reachable words in the I branch. FASTS and FASTI sit in the A branch, and only the first of those is a word you would use.
T dominates the fourth box with seven of the eighteen, thirty nine percent, which is the strongest single signal anywhere on the page.
Y closes five of these and S another four. Between them that is nine of the eighteen, so ruling both out cuts the page in half at a stroke.
Both are ordinary words and they differ in three boxes, so as a pair they narrow well. FUSSY also tests the doubled S.
A shallow depression, and also a carnivore found in Madagascar. FOSSE is a separate word meaning a ditch and both are on this list.
FUSE is a short common word and English hangs several endings off it. That single stem accounts for a large share of the U branch.