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Twenty five words put C first and D third, and fifty six percent of them take E in the fourth box.
A takes the second box in nine of the twenty five, thirty six percent, and O takes eight. E takes five, with I, Y and U on one each.
So the second box is close to a coin flip between A and O. Settle it and the page halves, which is better than most patterns of this size manage.
CODED, CODER, CODES and CODEC all sit on one stem and differ only in the last box. CODEN and CODEX join them, which makes the O branch a run of words separated by a single letter.
CADET is the most common word on the page and it comes from the A branch. CADRE and CADGE follow, with CADDY and CADGY behind them.
CEDAR and CIDER are the useful entries outside both branches, and CYDER is the variant spelling of the second. Either one splits the page better than another CODE guess.
E fills the fourth box in fourteen of the twenty five, so testing it is close to wasted. S closes six words and R another five, which is where the work actually is.
Both are common and they differ in three boxes. CADET tests the largest branch and CEDAR tests a letter that appears nowhere else in the second box.
Both appear on this list as variant spellings. They differ only in the second box, so confirm that letter before committing.
An errand boy, the older form of caddie. It sits in the A branch with CADIS and CADEE and is not one you would guess.