1. Given strings can be empty.
2. Same longest common sequences can be found twice, in which case you should print that only once.
Input
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a
bidbi
bi
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No common sequence.
bi
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a
bidbi
bi
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No common sequence.
bi
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1 4 sum:5
8 2 sum:10
10 5 4 sum:19
10 23 1 2 3 4 5 7 sum:55
43 2 sum:45