Lines ← ⊜(⊜⋕≠@ .)≠@\n.&fras"09.in"
One ← /+;⍢⊃(≡/-◫2)(⊂⊢⇌)(/↥≠0):[]
Two ← /+×ⁿ:¯1⇌◿2⇡⧻.;⍢⊃(≡/-◫2)(⊂⊢)(/↥≠0):[]
∩/+⊃≡One≡Two Lines