OUTPUT FOR C1.DAT

Between D1 and D4
Between E7 and E10
Between H2 and H8
Between J7 and J10
Between A2 and D2
Between F2 and J2
Between D4 and H4
Between C7 and H7
Between B9 and G9

OUTPUT FOR C2.DAT

Between H1 and H4
Between A3 and J3
Between F9 and J9