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-rw-r--r--challenge-112/mark-anderson/raku/ch-2.raku2
1 files changed, 1 insertions, 1 deletions
diff --git a/challenge-112/mark-anderson/raku/ch-2.raku b/challenge-112/mark-anderson/raku/ch-2.raku
index 5f381b8fba..7a4edaffde 100644
--- a/challenge-112/mark-anderson/raku/ch-2.raku
+++ b/challenge-112/mark-anderson/raku/ch-2.raku
@@ -121,7 +121,7 @@ multi MAIN(UInt $u)
.say for $seq;
}
-sub stairs($u)
+sub stairs(UInt $u)
{
my $head = ('100' x $u).substr(0, $u).parse-base(2);
my $tail = ('110' x $u).substr(0, $u).parse-base(2);