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Ninety words start with RO, and the third box spreads wider than any single branch can carry.
O and U each take it in twelve of the ninety, with T on nine and W on seven. Twenty one letters appear there and the leaders hold only thirteen percent each.
ROUND, ROYAL, ROBOT, ROAST and ROUGH sit at the top, with ROOMS, ROUTE, ROGUE and ROBIN close behind.
E fills the fourth box in twenty five of the ninety, twenty eight percent, more than any other letter. ROPED, ROBES, ROSES and ROVER all run through it.
ROODS, ROOFS, ROOMS, ROOST and ROOTS all carry a doubled O, and they account for much of the fourteen repeats on the page. ROUGH, ROUND, ROUSE and ROUTE make up the U branch and none of them repeats anything.
S closes twenty five of the ninety, twenty eight percent, with Y on eleven and N on nine.
So the last box is the cheapest thing to test here, and the third box is the most expensive. Work them in that order.
Both are common and they test different third letters. ROUND also covers N at the end, which nine words here take.
The ROO shape is productive in English, giving ROODS, ROOFS, ROOMS, ROOST and ROOTS. It is where most of the fourteen repeats come from.
An oak tree. It sits in the B branch and is the sort of entry that pads the count.