1 &fras ⊣ &args 2 3 ⊜∘⊸≠@\n 4 5 ⊜□+1⊃⍜♭⊛(⇡△) 6 7 A ← /+≡(/+¬∊:+⊂⟜¯⋯1_2¤)⟜¤ 8 B ← ( 9 ◴♭₂⊞+-1×2⋯⇡4⟜¤×2 10 /+≡(↥⊃(◿2/+|×2/×⧈≠)∊:+-1×2⍜↘₂⇌⋯⇡4¤) 11 ) 12 13 ∩(/+×)⊙,≡◇⊃B A ⟜≡◇⧻