Question: Suppose we use the CloSpan algorithm to find all closed sequential patterns from a sequence database with ( absolute ) minimum support 1 5 .

Suppose we use the CloSpan algorithm to find all closed sequential patterns from a sequence database with (absolute) minimum support 15. During the mining process, we derive the following sequences along with the sizes of their projected DBs: : 50,50,30, : 30. Then we use the backward sub-pattern rule and the backward super-pattern rule to prune redundant search space. Which of the projected DBs will remain after the pruning?

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