diff --git a/src/ex/q077.clj b/src/ex/q077.clj
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+++ b/src/ex/q077.clj
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+;; https://4clojure.oxal.org/#/problem/077
+ 
+(ns ex.q077)
+
+(defn ans
+  "Problem 77, Anagram Finder"
+  [coll]
+  (letfn [(hash-word [w] (->> w sort (apply str) hash))]
+    (set
+     (filter #(> (count %) 1)
+             (map set (vals (group-by hash-word coll)))))))
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diff --git a/test/ex/q077_test.clj b/test/ex/q077_test.clj
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+++ b/test/ex/q077_test.clj
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+;; https://4clojure.oxal.org/#/problem/077
+ 
+(ns ex.q077-test
+  (:require [clojure.test :as t]
+            [ex.q077 :as sut]))
+
+(t/deftest test-q77
+  (t/testing "Problem 77, Anagram Finder"
+    (t/is (= #{#{"meat" "team" "mate"}}
+             (sut/ans ["meat" "mat" "team" "mate" "eat"])))
+    (t/is (= #{#{"veer" "ever"} #{"lake" "kale"} #{"mite" "item"}}
+             (sut/ans ["veer" "lake" "item" "kale" "mite" "ever"])))))
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