diff --git a/.travis.yml b/.travis.yml
index 455f3c0..45c29f6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: clojure
-lein: lein2
-script: lein2 midje :config .midje-grading-config.clj
+lein: lein
+script: lein midje :config .midje-grading-config.clj
 jdk:
   - openjdk7
 notifications:
diff --git a/src/recursion.clj b/src/recursion.clj
index 95d77aa..abe6f42 100644
--- a/src/recursion.clj
+++ b/src/recursion.clj
@@ -1,85 +1,166 @@
 (ns recursion)
 
 (defn product [coll]
-  :-)
+  (if (empty? coll)
+    1
+    (* (first coll)
+       (product (rest coll)))))
 
 (defn singleton? [coll]
-  :-)
+  (if (or (not (empty? (rest coll))) (empty? coll))
+    false
+    true))
 
 (defn my-last [coll]
-  :-)
+  (if (empty? coll) nil
+    (if (empty? (rest coll)) (first coll)
+      (my-last (rest coll)))))
 
 (defn max-element [a-seq]
-  :-)
+  (if (or (singleton? a-seq) (empty? a-seq)) (first a-seq)
+    (max (first a-seq) (max-element (rest a-seq)))))
+
+
 
 (defn seq-max [seq-1 seq-2]
-  [:-])
+  (if (> (count seq-1) (count seq-2))
+    seq-1
+    seq-2))
 
 (defn longest-sequence [a-seq]
-  [:-])
+  (if (or (singleton? a-seq) (empty? a-seq)) (first a-seq)
+    (seq-max (first a-seq) (longest-sequence (rest a-seq)))))
 
 (defn my-filter [pred? a-seq]
-  [:-])
+  (if (empty? a-seq)
+    a-seq
+    (if (pred? (first a-seq))
+      (cons (first a-seq) (my-filter pred? (rest a-seq)))
+      (my-filter pred? (rest a-seq)))))
 
 (defn sequence-contains? [elem a-seq]
-  :-)
+  (cond
+    (empty? a-seq)
+      false
+    (not (= elem (first a-seq)))
+      (sequence-contains? elem (rest a-seq))
+     :else
+       true))
 
 (defn my-take-while [pred? a-seq]
-  [:-])
+  (cond
+    (empty? a-seq) ()
+    (not (pred? (first a-seq))) ()
+    :else (cons (first a-seq) (my-take-while pred? (rest a-seq)))))
 
 (defn my-drop-while [pred? a-seq]
-  [:-])
+  (cond
+    (empty? a-seq)
+      a-seq
+    (pred? (first a-seq))
+      (my-drop-while pred? (rest a-seq))
+    :else a-seq))
 
 (defn seq= [a-seq b-seq]
-  :-)
+  (cond
+    (and (empty? a-seq) (empty? b-seq))
+    true
+    (or (empty? a-seq) (empty? b-seq))
+    false
+    (not (= (first a-seq) (first b-seq)))
+    false
+    :else (seq= (rest a-seq) (rest b-seq))))
+
 
 (defn my-map [f seq-1 seq-2]
-  [:-])
+  (if (or (empty? seq-1) (empty? seq-2))
+    ()
+    (cons (f (first seq-1) (first seq-2)) (my-map f (rest seq-1) (rest seq-2)))))
 
 (defn power [n k]
-  :-)
+  (cond (zero? k)
+        1
+        (zero? n)
+        0
+        :else
+    (* n (power n (dec k)))))
 
 (defn fib [n]
-  :-)
+  (cond (== n 0)
+        0
+        (== n 1)
+        1
+        :else
+    (+ (fib (- n 1)) (fib (- n 2)))))
 
 (defn my-repeat [how-many-times what-to-repeat]
-  [:-])
+  (if (<= how-many-times 0)
+    ()
+    (cons what-to-repeat (my-repeat (dec how-many-times) what-to-repeat))))
 
 (defn my-range [up-to]
-  [:-])
+  (if (== up-to 0)
+    ()
+    (cons (dec up-to) (my-range (dec up-to)))))
 
 (defn tails [a-seq]
-  [:-])
+  (if (empty? a-seq)
+    (cons a-seq ())
+    (cons a-seq (tails (rest a-seq)))))
 
 (defn inits [a-seq]
-  [:-])
+  (map reverse (tails (reverse a-seq))))
 
 (defn rotations [a-seq]
-  [:-])
+  (if (empty? a-seq)
+    (concat [] [()])
+    (rest (map concat (tails a-seq) (reverse (inits a-seq))))))
 
 (defn my-frequencies-helper [freqs a-seq]
-  [:-])
+  (if (empty? a-seq)
+    freqs
+    (if (contains? freqs (first a-seq))
+      (my-frequencies-helper (assoc freqs (first a-seq) (inc (get freqs (first a-seq)))) (rest a-seq))
+      (let [new-freqs (assoc freqs (first a-seq) 1)]
+            (my-frequencies-helper new-freqs (rest a-seq))))))
 
 (defn my-frequencies [a-seq]
-  [:-])
+  (my-frequencies-helper {} a-seq))
 
 (defn un-frequencies [a-map]
-  [:-])
+  (if (empty? a-map)
+    []
+    (let [[a b] (first a-map)]
+      (concat (repeat b a) (un-frequencies(rest a-map))))))
 
 (defn my-take [n coll]
-  [:-])
+  (if (or (empty? coll) (== n 0))
+    ()
+    (cons (first coll) (my-take (dec n) (rest coll)))))
 
 (defn my-drop [n coll]
-  [:-])
+  (if (== n 0)
+    coll
+    (my-drop (dec n) (rest coll))))
 
 (defn halve [a-seq]
-  [:-])
+  (let [osa1 (int (/ (count a-seq) 2))]
+    [(my-take osa1 a-seq) (my-drop osa1 a-seq)]))
 
 (defn seq-merge [a-seq b-seq]
-  [:-])
+  (cond
+    (empty? a-seq) b-seq
+    (empty? b-seq) a-seq
+    :else (if (< (first a-seq) (first b-seq))
+      (concat [(first a-seq)] (seq-merge (rest a-seq) b-seq))
+      (concat [(first b-seq)] (seq-merge a-seq (rest b-seq)))
+    )))
 
 (defn merge-sort [a-seq]
-  [:-])
+  (if (or (== (count a-seq) 1) (== (count a-seq) 0))
+    (seq-merge [] a-seq)
+    (let [[eka toka] (halve a-seq)]
+      (seq-merge (merge-sort eka) (merge-sort toka)))))
 
 (defn split-into-monotonics [a-seq]
   [:-])