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Seventeen words put R first and F third, and five of them repeat a letter.
E takes the second box in eight of the seventeen, forty seven percent, and I takes five. A and U take two each and no consonant appears there at all.
REFED, REFEL, REFER, REFIT, REFIX, REFLY and REFRY all come off it, which is the whole E branch. Most are built by attaching RE to a short verb.
REFER is the only one in common use. So the largest branch on the page holds a single word you would actually guess, which is worth knowing before you spend a turn there.
RAFFS, RIFFS, RUFFE and RUFFS put a second F in the fourth box. F takes that box in five of the seventeen, more than any other letter.
So a visible double points straight at that group, and the vowel then decides between them.
S closes five of the seventeen, twenty nine percent, with Y on three.
RIFLE is the most common word on the page and it sits in the I branch, away from both the REF stem and the doubled F group. That makes it the best opening here.
RIFLE. Both are common, but REFER sits in a branch where it is the only useful word, so a hit there narrows less than it looks.
A small freshwater fish. It sits with RUFFS in the doubled F group and the two differ only in the last box.
An F in the third box needs a vowel in front of it at five letters. That rules out every consonant automatically and leaves only the vowel branches.