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B=8, D=6, E=5, F=4, H=2
1. A and C= 1 and 3; G=7; I=9
2. A and C= 1 and 9; G and I = 3 and 7
3. A and C= 7 and 9; G=3; I=1
183654729
381654729
189654327
189654723
981654327
981654723
789654321
987654321
These 8 numbers satisfy all the conditions except for divisibility by 7.
Is there a way to get the correct answer without checking each number individually?