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Eighty seven words put C first and O third, and twenty seven of them repeat a letter. That is a far higher share than most patterns carry.
L takes the second box in twenty six words, H in twenty one and R in twenty one. O itself takes seventeen. Having them all sit inside a few words of each other is rare, and it means the second box narrows less here than almost anywhere.
The O branch is what explains the doubling. COOKS, COOLS, COOED and COOMB all put a second O straight after the first, which is where most of the repeats come from.
Words like COVER and COMET start with the letters C and O together, which puts the O in the second box rather than the third. This pattern needs something between them, and that something is almost always L, H or R.
CLOUD tests the largest branch and two common endings at once. If it comes back empty, CHOIR moves you to the H branch and CROWD to the R branch, so three guesses can separate the whole pattern.
The O branch does it. Once a word starts CO and needs O in the third box, a doubled O is the natural result, and seventeen words take that route.
Yes. It runs C, H, O, S, E, so the O sits third. CHORD and CHORE follow the same shape with different endings.
S, on eighteen words, then E on fourteen and K on ten. The K is unusually high and comes from CLOCK, CHOCK and the OOK words.