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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2016/06.txt	Wed Dec 11 19:08:00 2019 -0500
@@ -0,0 +1,650 @@
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2016/days/day-06.lisp	Wed Dec 11 19:08:00 2019 -0500
@@ -0,0 +1,22 @@
+(defpackage :advent/2016/06 #.cl-user::*advent-use*)
+(in-package :advent/2016/06)
+
+(defun freqs (lines)
+  (iterate
+    (for i :from 0 :below (length (first lines)))
+    (collect (frequencies lines :key (rcurry #'elt i)))))
+
+(defun freq-extrema (predicate freqs)
+  (_ freqs
+     alexandria:hash-table-alist
+     (extrema predicate _ :key #'cdr)
+     car))
+
+(define-problem (2016 6) (data read-lines) ("nabgqlcw" "ovtrjcjh")
+  (values
+    (map 'string (curry #'freq-extrema #'>) (freqs data))
+    (map 'string (curry #'freq-extrema #'<) (freqs data))))
+
+
+
+#; Scratch --------------------------------------------------------------------