0-1 parallel: items: "0"
1-2 parallel: items: "1"
2-3 parallel: items: "2"
3-4 parallel: items: "3"
4-5 parallel: items: "4"
5-6 parallel: items: "5"
6-7 parallel: items: "6"
7-8 parallel: items: "7"
8-9 parallel: items: "8"