diff --git a/aoc.org b/aoc.org
index abe5efe..0952aa1 100644
--- a/aoc.org
+++ b/aoc.org
@@ -4590,3 +4590,38 @@ NOW we can multiply everything:
 : 3898725600
 
 AND THAT IS CORRECT 😎
+
+* Interlude: A Macro
+
+I need to write a macro to reduce boilerplate
+
+#+NAME: aoc
+#+begin_src emacs-lisp
+  (defmacro aoc (input &rest body)
+    "Reduce boilerplate for AoC challenges."
+    `(let ((lines (split-string ,input "\n+")))
+       ,@body))
+#+end_src
+
+** testing it
+:PROPERTIES:
+:header-args: :noweb yes
+:END:
+
+#+begin_src emacs-lisp :var input=input-1a
+  <<aoc>>
+  (aoc input
+       (let ((list (seq-map #'string-to-number lines))
+             (result 0))
+         (catch 'return
+           (while list
+             (setq n (pop list))
+             (dolist (m list result)
+               (when (= (+ n m) 2020)
+                 (throw 'return (* n m))))))))
+#+end_src
+
+#+RESULTS:
+: 969024
+
+Cool, it works ^_^