- $ ./new
- 0 -> 1
- branch start
- branch choice start
- 1 -> 2
- 2 -> 3
- branch start
- branch choice start
- 3 -> 4
- 4 -> 5
- branch choice end
- branch end
- branch choice end
- branch choice start
- 5 -> 6
- 6 -> 7
- branch start
- branch choice start
- 7 -> 8
- 8 -> 9
- branch choice end
- branch end
- branch choice end
- branch end
- 9 -> 10
- NULL