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diff --git a/users/sterni/exercises/aoc/2022/11/11.bqn b/users/sterni/exercises/aoc/2022/11/11.bqn
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+# needs export BQNLIBS=/path/to/mlochbaum/bqn-libs
+⟨Split⟩ ← •Import "/strings.bqn"∾˜¯1↓1⊑•SH "printenv"‿"BQNLIBS"
+⟨ReadDec⟩ ← •Import "../../lib.bqn"
+MakeOp ← {
+  𝕊 a‿"+"‿b: 𝕊 a‿+‿b;
+  𝕊 a‿"*"‿b: 𝕊 a‿×‿b;
+  𝕊 a‿op‿b:
+  is‿xs ← (<"old") (≡¨⊔⊢) a‿b
+  {op´ (𝕩⋆≠xs) ∾ReadDec¨ is}
+}
+ParseMonkey ← {
+  ·‿items‿op‿if‿then‿else:
+  {
+    initial ⇐ ReadDec¨ ", " Split 18↓items
+    op ⇐ MakeOp " " Split 19↓op
+    if ⇐ ReadDec 21↓if
+    then ⇐ ReadDec 29↓then
+    else ⇐ ReadDec 30↓else
+  }
+}
+monkeys ← ParseMonkey¨ 1↓' '((+`(≠⟜⊑)¨)⊔⊢)0(≠⟜≠¨/⊢)•FLines "input"
+items ← {𝕩.initial}¨ monkeys
+lim ← ×´{𝕩.if}¨ monkeys
+
+Sim ← {
+  div 𝕊 len:
+  Turn ← {
+    items 𝕊 turnidx:
+    i ← (≠monkeys)|turnidx
+    m ← i⊑monkeys
+
+    worry ← lim|⌊div÷˜ m.Op¨ i⊑items
+    else‿then ← 2↑0 (=⟜(m.if⊸|)⊔⊢) worry
+
+    ⟨then, else⟩⊸(∾˜¨)⌾(m.then‿m.else⊸⊏) ⟨⟩˙⌾(i⊸⊑) items
+  }
+  ×´2↑∨+˝(<items) ((≠⊑)⊸(>((↕⊣)=|)¨)×(≠¨˘)∘>∘(⊣»Turn`)) ↕len×≠items
+}
+
+•Out "day11.1: "∾•Fmt 3 Sim 20
+•Out "day11.2: "∾•Fmt 1 Sim 10000