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Forty two words put C first and N third, and the CON and CAN openings take more than three quarters of them.
O takes the second box in seventeen of the forty two, forty percent, and A takes fifteen. That is thirty two of the page from two letters, with E, I and U sharing three each.
So the second box is close to a coin flip between O and A. Answer it and you have cut the page roughly in half, which is better than most patterns manage.
CANOE, CANAL, CANDY, CANON and CANES carry the A branch. CONES, CONDO, CONEY and CONIC carry the O branch. Both are full of ordinary words, which is unusual for branches this size.
CINCH and CYNIC are the two worth knowing. CENSE, CENTO and CENTS fill out the E branch and CUNDY and CUNEI the U branch, none of which you would produce unprompted.
T leads the fourth box on eight words and E follows on eight. S closes nine of the forty two with Y and O on six each, so the last box stays open longer than the second.
CANOE is the more common word and it tests the A branch. If the second letter comes back as O instead, CONES follows naturally.
Yes, it runs C, Y, N, I, C. It is the only word here with Y in the second box, so guessing it either wins or eliminates one entry.
A medieval love song. It sits in the A branch alongside CANST and CANTO and none of those three is a realistic guess.