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diff --git a/challenge-335/barroff/raku/ch-1.p6 b/challenge-335/barroff/raku/ch-1.p6
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+++ b/challenge-335/barroff/raku/ch-1.p6
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+#!/usr/bin/env raku
+
+use v6.d;
+
+sub common-characters(@words --> Seq) {
+    (reduce { $^a ∩ $^b }, @words.map({ $_.comb.Bag })).kxxv
+}
+
+#| Run test cases
+multi sub MAIN('test') {
+    use Test;
+    plan 5;
+
+    is common-characters(["bella", "label", "roller"]).sort, ["e", "l", "l"],
+        'works for "bella", "label", "roller"';
+    is common-characters(["cool", "lock", "cook"]).sort, ["c", "o"],
+        'works for "cool", "lock", "cook"';
+    is common-characters(["hello", "world", "pole"]).sort, ["l", "o"],
+        'works for "hello", "world", "pole"';
+    is common-characters(["abc", "def", "ghi"]).sort, [],
+        'works for "abc", "def", "ghi"';
+    is common-characters(["aab", "aac", "aaa"]).sort, ["a", "a"],
+        'works for "aab", "aac", "aaa"';
+}
+
+#| Take user provided words like Perl Weekly Challenge
+multi sub MAIN(*@words) {
+    say common-characters(@words);
+}