Merkitse alla oleviin laatikkoihin kirjain vastauksesi kohdalle.

6 – 7 = U
-2 + 4 = S
-4 + 7 = O
-11 + 11 = U
12 – 8 = R
6 – 9 = K
-5 + 10 = A
-1 – 1 = L
11 – 15 = U

-2: -1: -3: 0: 2: -4: 3: 4: 5: