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+⟨SplitOn, ReadDec⟩ ← •Import "../../lib.bqn"
+
+Sections ← {
+  a‿b ← ReadDec¨ (<'-') SplitOn 𝕩
+  ↕⌾(-⟜a) 1+b
+}
+i ← ∘‿2⥊Sections¨ ∾(<',') SplitOn¨ •FLines "input"
+Is ← ∊´∘((⍋≠¨)⊏⊢)
+
+•Out "day04.1: "∾•Fmt +´(∧´Is)˘ i
+•Out "day04.2: "∾•Fmt +´(∨´Is)˘ i