2 files changed, 31 insertions, 0 deletions
diff --git a/challenge-090/feng-chang/raku/ch-1.raku b/challenge-090/feng-chang/raku/ch-1.raku
new file mode 100755
index 0000000000..d25e180f77
--- /dev/null
+++ b/challenge-090/feng-chang/raku/ch-1.raku
@@ -0,0 +1,11 @@
+#!/bin/env raku
+
+my \DNA = 'GTAAACCCCTTTTCATTTAGACAGATCGACTCCTTATCCATTCTCAGAGATGTGTTGCTGGTCGCCG';
+
+# Task 1
+my %nuclei-count;
+DNA.comb.map({ ++%nuclei-count{ $_ } });
+put "nucleiobase count:\n\t", %nuclei-count.gist;
+
+# Task 2
+put "the complementary sequence:\n\t{ with DNA { TR/TAGC/ATCG/ } }";
diff --git a/challenge-090/feng-chang/raku/ch-2.raku b/challenge-090/feng-chang/raku/ch-2.raku
new file mode 100755
index 0000000000..eb089b92c9
--- /dev/null
+++ b/challenge-090/feng-chang/raku/ch-2.raku
@@ -0,0 +1,20 @@
+#!/bin/env raku
+
+sub MAIN(UInt:D $A, UInt:D $B) {
+    my ($a, $b) = ($A, $B);
+    my ($aw, $bw) = ($a.chars, ($b * $a).chars);
+    my @R;
+
+    repeat {
+        put "{ $a.fmt("%{ $aw }d") } & { $b.fmt("%{ $bw }d") }";
+        @R.push([$a, $b]);
+
+        $a div= 2;
+        $b   *= 2;
+    } while $a > 0;
+
+    put '-' x ($aw + $bw + 3);
+
+    my @S = @R.grep(*.[0] !%% 2).map(*.[1]);
+    put @S.join(' + '), ' = ', @S.sum;
+}