From: Improving workflow design by mining reusable tasks
Customer ID
Sequence of bought items
1
< (30) (90) >
2
< (10 20) (30) (40 60 70) >
3
< (30 50 70) >
4
< (30) (40 70) (90) >
5
< (90) >
6
< (30) (40) (70) (90) >