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/predicates.clj b/src/predicates.clj
index 158b1ea..2705f08 100644
--- a/src/predicates.clj
+++ b/src/predicates.clj
@@ -1,41 +1,42 @@
 (ns predicates)
 
 (defn sum-f [f g x]
-  :-)
+  (+ (f x) (g x)))
 
 (defn less-than [n]
-  :-)
+  #(< % n))
 
 (defn equal-to [n]
-  :-)
+  #(== % n))
 
 (defn set->predicate [a-set]
-  :-)
+  #(contains? a-set %))
 
 (defn pred-and [pred1 pred2]
-  :-)
+  #(and (pred1 %) (pred2 %)))
 
 (defn pred-or [pred1 pred2]
-  :-)
+  #(or (pred1 %) (pred2 %)))
 
 (defn whitespace? [character]
   (Character/isWhitespace character))
 
 (defn blank? [string]
-  :-)
+  (every? whitespace? string))
 
 (defn has-award? [book award]
-  :-)
+  (contains? (:awards book) award))
 
 (defn HAS-ALL-THE-AWARDS? [book awards]
-  :-)
+  (every? #(has-award? book %) awards))
 
 (defn my-some [pred a-seq]
-  :-)
+  (first (filter identity (map pred a-seq))))
 
 (defn my-every? [pred a-seq]
-  :-)
+  (empty? (filter identity (map (complement pred) a-seq))))
 
 (defn prime? [n]
-  :-)
+  (let [pred #(= 0 (mod n %))]
+    (not (some pred (range 2 n)))))
 ;^^