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diff --git a/users/sterni/exercises/aoc/lib.bqn b/users/sterni/exercises/aoc/lib.bqn
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+IsAsciiNum ⇐ ('0'⊸≤∧≤⟜'9')
+
+ReadInt ⇐ {(𝕨⊸×+⊣)´∘⌽-⟜'0'𝕩} # stolen from leah2
+ReadDec ⇐ 10⊸ReadInt
+
+SplitOn ⇐ ((⊢ (-1˙)⍟⊣¨ +`∘(1⊸»<⊢))∘(≡¨)⊔⊢)
+
+_fix ⇐ {𝕩 𝕊∘⊢⍟≢ 𝔽 𝕩}