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+unit module ModuleCH02;
+
+=begin pod
+
+=head1 Rankings
+
+=item B«Standard Ranking (1224)»: Items that compare equal receive the same
+    ranking number, and then a gap is left right after any set of equal-ranking
+    items.
+
+For instance, let (A, B, C, D) be a group of scores where A is ranked above 
+any other item, B and C compare equal and D follows the items comparing equal.
+
+"A", which ranks above any other items, receives ranking number 1. Then, B
+and C receive the following ranking number, 2. Because D follows a group of
+equal-ranking items, it receives the ranking number after the gap at 3. 
+Thus, D is ranked fourth (4).
+
+Therefore, we have the ranking 1224.
+
+=item B«Modified Ranking (1334)»: Items that compare equal receive the same
+    ranking number however, unlike standard ranking, a gap is left right before
+    any set of equal-ranking items.
+
+"A", which ranks above any other items, receives ranking number 1. Then, B
+and C receive the following ranking number. However, their ranking number 
+is one plus the gap at 2. Thus, they receive the ranking number 3. D receives
+the ranking number 4.
+
+Therefore, we have the ranking 1334.
+
+=item B«Dense Ranking (1223)»: Items that compare equally receive the same
+    ranking number, and the next item(s) receive the immediately following
+    ranking number.
+
+"A", which ranks above any other items, receives ranking number 1. Then, B and
+C receive the immediately following ranking number, 2. Same for D, 
+which receives the ranking number 3.
+
+Therefore, we have the ranking 1223.
+
+=head1 Subroutines
+=end pod
+
+=begin comment
+Challenge 009#2:
+Write a script to perform the different types of ranking described above.
+=end comment
+
+proto ranking( *@items where *.elems > 0, | ) is export { * }
+
+#| Perform standard competition ranking with given @items.
+multi ranking( *@items --> Array ) {
+    my Int:D @rankings = 1;
+
+    for 1..@items.end -> $i {
+        @rankings[$i] = do 
+            if @items[$i] cmp @items[$i-1] == Same { @rankings[$i - 1] }
+            else { $i + 1 }
+    }
+    return @rankings;
+}
+
+#| Perform modified competition ranking with given @items.
+multi ranking( *@items, :$modified! --> Array ) {
+    my Int:D @rankings = 1;
+
+    for 1..@items.end -> $i {
+        @rankings[$i] = do 
+            if @items[$i] cmp @items[$i-1] === Same {
+                @rankings[$i-1]
+            }
+            elsif @items[$i-2] and
+                  @items[$i-1] cmp @items[$i-2] === Same and
+                  @items[$i] ≠ (@items[$i-1], @items[$i-2]).all
+            {
+                @rankings[$i-1] + 1
+            }
+            else {
+                @rankings[$i-1] + 2
+            }
+    }
+    return @rankings;
+}
+
+#| Perform dense competition ranking with given @items.
+multi ranking( *@items, :$dense! --> Array ) {
+    my Int:D @rankings = 1;
+
+    for 1..@items.end -> $i {
+        @rankings[$i] = do 
+            if @items[$i] cmp @items[$i-1] === Same { @rankings[$i - 1] }
+            else { @rankings.tail + 1 }
+    }
+    return @rankings;
+}