Recommended problems from Programming Pearls

Column 1: 1,2,3,5,6,9

Column 2: 2,4,5,7,8

Column 4 1,2,3,4,6,7,8,9

Column 5: 3,5,7

Column 6: 6

Column 7: 2,3,7,9,11

Column 8: 1,3,6,7,8,9,10,11,12,14

Column 9: 4,7,8,9,11,12

Column 11: 1,2,4,6,9,11

Column 13: 3,4,7

Column 14: 1,2,3,4,7,8