diff --git a/vwowrla.core/repl/tools.clj b/vwowrla.core/repl/tools.clj
new file mode 100644
index 0000000..6c3c8df
--- /dev/null
+++ b/vwowrla.core/repl/tools.clj
@@ -0,0 +1,25 @@
+(ns tools
+  (:import
+    (java.util TimeZone))
+  (:require
+    [clojure.java.io :as io])
+  (:use
+    vwowrla.core.parser))
+
+(def opts {:log-owner-char-name "Blasticus"
+           :year                2016
+           :timezone            (TimeZone/getDefault)
+           :windows?            false})
+
+(defn collect-unique-entity-names
+  [f options]
+  (with-open [rdr (io/reader f)]
+    (->> (line-seq rdr)
+         (reduce
+           (fn [entity-names ^String line]
+             (let [event (parse-line line options)]
+               (-> entity-names
+                   (conj (:source-name event))
+                   (conj (:target-name event)))))
+           #{})
+         (remove nil?))))