diff --git a/src/day01.clj b/src/day01.clj
index 81afb91..ccc58c6 100644
--- a/src/day01.clj
+++ b/src/day01.clj
@@ -43,7 +43,73 @@
         sum (reduce + 0 numbers)]
     (str sum)))
 
+;
+;
+;
+;
+;
+;
+;
+;
+;
+;
+
+; It looks like some of the digits are actually spelled out with letters:
+; one, two, three, four, five, six, seven, eight, and nine also count as valid "digits".
+; you now need to find the real first and last digit on each line
+
+; Vector of List of String,String
+(def patterns ['("one" "1") '("two" "2") '("three" "3")
+               '("four" "4") '("five" "5") '("six" "6")
+               '("seven" "7") '("eight" "8") '("nine" "9")])
+
+; the search tree
+; a node is a list with `:n` as first element, and then
+; many options list. Each list option is a (Char, Node|Leaf).
+; A leaf is (:l Int)
+
+; Tree :: Vec of Node | Leaf
+;
+; Node :: (Char, Tree)
+; Leaf :: String
+;
+; tree [
+;       (\a "1")
+;        ]
+;
+;
+
+; adds a new word to the current search tree
+(defn build-search-tree
+  ([] '())
+  ; (Tree, String, String) -> Tree
+  ([prev-tree new-word new-value]
+   (let
+     ; Vec of Char
+    [new-letters (sequence new-word)])))
+
+(defn new-leaf [value] value)
+(defn new-node [char tree] (list char tree))
+
+(def tree (new-node \a (new-leaf "A")))
+
+; (build-search-tree "a" "1")
+
+; Search tree that, given a starting index `idx`,
+; attempt to find a textual digit at that position.
+(defn digit-at? [letters idx])
+
+; Given "one3two4six" returns "13246"
+; Given "eighttwothree" should include "823" somewhere, in that order
+; String -> String
+(defn sanitize-str [input]
+  (reduce (fn [acc next] (clojure.string/replace acc (first next) (last next))) input patterns))
+
 (defn part2 []
-  (println "here will be the solution to day 1 part 2"))
+  (let [sanitized-lines (map sanitize-str lines)
+        numbers-str (map calibration-value-1 sanitized-lines)
+        numbers (map Integer/parseInt numbers-str)
+        sum (reduce + 0 numbers)]
+    (str sum)))