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R first and F third covers 23 words, and the box between them is always a vowel.
E leads at about thirty nine percent, I at twenty six, A at twenty two and U at thirteen. No consonant appears in that box at all.
RAFTS and RIFTS differ in the box after the R, which makes them the pair most likely to be confused.
RIFFS and RUFFS do the same, so this page holds two separate pairs split by a single vowel.
RIFFS, RUFFS and RUFFE all double the F into the fourth box, which is a shape none of the common E branch words use.
REFER is the most common word here, and it repeats both its R and its E, which nothing else on the page does.
So if an R comes back in the last box as well as the first, REFER is very nearly the answer on its own.
No. ROOFS puts O in the second box and a second O in the third. The F lands fourth.
RIFLE. Its L is a letter no other common entry uses, and its I covers the second largest branch.
An R followed by a consonant and then an F leaves nothing workable in English, so every entry takes a vowel there.