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9 (9-0=9, 9-1=8, 9-2=7, 9-3=6, 9-4=5, 9-5=4, 9-6=3, 9-7=2, 9-8=1, 9-0=9,…
9
9-0=9
9-1=8
9-2=7
9-3=6
9-4=5
9-5=4
9-6=3
9-7=2
9-8=1
9-0=9
0+9=9
1+8=9
2+7=9
3+6=9
4+5=9
5+4=9
6+3=9
7+2=9
8+1=9
9+0=9