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+Solution by Scott Sotka
+
diff --git a/challenge-251/bn-ssotka/raku/ch-251.raku b/challenge-251/bn-ssotka/raku/ch-251.raku
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+#!/usr/bin/env raku
+
+# Write a script to find the concatenation value of the given array.
+
+# The concatenation of two numbers is the number formed by concatenating their numerals.
+
+# For example, the concatenation of 10, 21 is 1021.
+# The concatenation value of @ints is initially equal to 0.
+# Perform this operation until @ints becomes empty:
+
+# If there exists more than one number in @ints, pick the first element
+# and last element in @ints respectively and add the value of their
+# concatenation to the concatenation value of @ints, then delete the
+# first and last element from @ints.
+
+# If one element exists, add its value to the concatenation value of
+# @ints, then delete it.
+
+sub concat (@ints) {
+    say "Got ",@ints;
+    return 0 unless @ints;
+    return @ints[0] if @ints == 1;
+    return (@ints[0].Str ~ @ints[*-1].Str).Int + concat(@ints[1..*-2]);
+}
+
+multi MAIN (*@ints){
+    say concat(@ints);
+}
+multi MAIN {
+    my @tests = ((6, 12, 25, 1),
+                 (10, 7, 31, 5, 2, 2),
+                 (1, 2, 10));
+    for @tests -> @t {
+        say concat(@t);
+    }
+}
+\ No newline at end of file