1  &fras ⊣ &args
 2  
 3  ⊜□≠@\n.
 4  
 5  CdRoot   ← ↙0
 6  CdParent ← ↘¯1
 7  CdChild  ← ⊂:□
 8  File     ← ⊃⋅⋅∘(insert:⊙(□⊂:□))⋕
 9  
10  ⊙({}map.[])
11  ◌∧◇⍣(
12    CdRoot °$"$ cd /"
13  | CdParent °$"$ cd .."
14  | CdChild°$"$ cd _"
15  | °$"$ ls"
16  | ◌°$"dir _"
17  | File °$"_ _")
18  
19  °map⊙(map.[])
20  ∧◇(∧(insert⊙+:◡(⬚0get⊙◌))⍚↙⇡⊃⧻¤)
21  
22  A ← /+×≤100000.
23  B ← /↧▽⊸≥-:30000000-:70000000⊸get□{}
24  
25  ⊃B A