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Solution
9
9
0
0
1
1
0
0
0
9
0
0
0
0
0
0
0
1
0
1
Step 1
9
9
0
0
1
1
9
0
Step 2
9
9
0
0
1
1
0
9
0
0
0
0
Step 3
9
9
0
0
1
1
0
0
9
0
0
0
0
0
0
0
Step 4
9
9
0
0
1
1
0
0
0
9
0
0
0
0
0
0
0
1
0
1