Each letter in these KenKen grids corresponds to a unique number between 1 and 12. Can you figure out which numbers go to each letter?

(A brief explanation of KenKen: in each of these grids, every row and every column contains the numbers 1 through 4 in some order. The label in a box indicates the result of performing the operation on all the numbers in that box; for instance, a box labeled '3−' means that the difference of the two numbers in the box is 3; a box labeled '16×' means that the product of all the numbers in the box is 16.)

3 | 5 | 6 | 1 | 11 | 9 | 10 | 4 | 7 | 5 | 5 | 8 | 9 | 2 | 10 | 12 |