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One hundred six words start with RA, and the fourth box is an E in well over a third of them.
T takes the third box in twelve of the one hundred six, N in eleven, and G and M in seven each. Twenty one letters appear there, so no branch is worth chasing.
RADIO, RAISE, RAPID, RANGE and RATIO are the entries most likely to be wanted, with RADAR, RALLY and RAZOR behind them.
E fills the fourth box in forty of the one hundred six, thirty eight percent, which is the strongest single fact on the page. Assume it rather than test it.
RATED, RATER and RATES differ only at the end, and RACED, RACER and RACES mirror them one letter over. The E fourth box is what produces all those near duplicates, which is why the last letter decides so much here.
S closes thirty one of the one hundred six, twenty nine percent, with E on fourteen, D on thirteen and R on twelve. Between them they take most of the last box.
Both are common and they differ in three boxes. RAISE tests the E fourth box directly, which forty words here take.
The E fourth box turns short verbs into matched triples. RATED, RATER and RATES is the pattern, and it repeats across several stems.
Fifteen, which is fourteen percent. RABBI, RAFFS and RALLY are the shapes behind it.