P₁ ← ⧻ P₂ ← ⊢⊜⧻⊸⍆ ⊃P₂P₁▽=₁₅₀≡⌟(⊃/+⧻▽)♭₂⇡≡⊸2&rl⋕&fo"i/17.in"
~
/
aoc15ua
/
17