a. b=0 a=0,1,2,3,4,5,6,7,8,9
b=1 a=0,1,2,3,4,5,6,7,8,9
b=2 a=0,1,2,3,4,5,6,7,8,9
b=3 a=0,1,2,3,4,5,6,7,8,9
b=4 a=0,1,2,3,4,5,6,7,8,9
b. b=5 a=0,1,2,3,4,5,6,7,8,9
b=6 a=0,1,2,3,4,5,6,7,8,9
b=7 a=0,1,2,3,4,5,6,7,8,9
b=8 a=0,1,2,3,4,5,6,7,8,9
b=9 a=0,1,2,3,4,5,6,7,8,9