a, C = {2; 4; 6}
b, D = {7; 9}
c, E = {1; 3; 5}
d, F = {1; 2; 3; 4; 5; 6; 7; 9}
a, C=(2; 4; 6)
b, B=(7 ; 9)
c, E=(1; 3; 5)
d, F=(1; 2; 3; 4; 5; 6; 7; 9;)
a/ c=(2,4,6); b/ d=(7,9) ;c/ e=(1,3,5) ;d/ f=(1,2,4,6,7,9)
C=(2,4,6) D=(7,9) E=(1,2,3,4,5,6,7,9) F=(1,2,3,4,5,6)