Answer:
1. (C,E,S,F,M,J,R,L,H);(C,E,S,F,M,J,R,L,D);(E,S,F,M,J,R,L,H,D);(C,E,S,F,M,J,R,H,D);(C,E,S,F,M,J,L,H,D);(C,E,S,F,M,R,L,H,D);(C,E,S,F,J,R,L,H,D);(C,E,S,M,J,R,L,H,D);(C,E,F,M,J,R,L,H,D);(C,S,F,M,J,R,L,H,D)
2. (1,3);(1,5);(1,7);(1,9);(3,5);(3,7);(3,9);(5,7);(5,9)(7,9)
3. Square, Circle, Rectangle, Triangle, Star, Hexagon, Pentagon
