[ps]overlapping[pe]: 2
├──[ps]first[pe]: 2
│  ├──[ps]second[pe]: 1
│  │  └──[ps]2_file[pe]: 3
│  │     └──[m0s]overlapping[m0e] [m1s]over[m1e]
│  └──[ps]first_file[pe]: 2
│     └──[m0s]overlapping[m0e]
└──[ps]top_file[pe]: 5
   └──[m0s]overlapping[m0e] [m1s]over[m1e] [m0s]overlapping[m0e]
