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+# Task 1 of The Weekly Challenge 268
+# https://theweeklychallenge.org/blog/perl-weekly-challenge-268/#TASK1
+
+# Test run:
+# $ raku ch-1.raku
+# 2
+# 3
+# 3
+# No such number
+
+
+my @tests =
+    ([3, 7, 5], [9, 5, 7]),
+    ([1, 2, 1], [5, 4, 4]),
+    ([2], [5]),
+    
+    ([3, 7, 5], [9, 5, 17]);
+
+for @tests -> (@a is copy, @b is copy) {
+    @a .= sort;
+    @b .= sort;
+
+    my $diff = @b[0] - @a[0];
+    if (@a >>+>> $diff eqv @b) {
+        say $diff;
+    }
+    else {
+        say "No such number";
+    }
+}