the following chips are sold
scan 1
row 3 chips 3,4,5
row 4 chips 1,2,3,4,5
row 5 chips 1,3,4
row 7 chips 1,2,5

scan 2
row 1 chips 3,5
row 2 chip 4
row 4 chip 4
row 5 chips 1,2
row 6 chip 1
row 7 chip 2

scan 3
row 1 chips 2,3,4
row 2 chip 3
row 4 chip 1
row 5 chips 1,2,3,4,5
row 6 chips 1,2,3,4,5
row 7 chip 4