1  &fras ⊣ &args
2  
3  ⊜≡⋕⊸≠@\n
4  
5  Neigh ← ▽=+1⊸⊢:⟜⬚0⊡+⊂0[◡∩¯⟜⇌⇡2]¤
6  ∩/+≡(∩⧻⟜◴≡◇⊣path(Neigh|=9⊡))⊚=0⟜¤