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+#!env raku
+
+
+
+
+# Write a script that accepts list of positive numbers (@L) and two positive numbers $X and $Y.
+# 
+# The script should print all possible numbers made by concatenating
+# the numbers from @L, whose length is exactly $X
+# but value is less than $Y.
+#     Example
+# 
+#   Input:
+# 
+#     @L = (0, 1, 2, 5);
+# $X = 2;
+# $Y = 21;
+# 
+#  Output:
+# 
+#     10, 11, 12, 15, 20
+
+
+
+sub MAIN ( ){
+    my @L = (0, 1, 2, 5);
+    my $x = 2;
+    my $y = 21;
+    my @LL;
+
+    # start from the very beginning of the list limiting
+    # the numbers in the range of $y
+    for ( 1 x $x ) - 1 ..^ $y {
+
+        # see if the numbers "grep" the list
+        my $found = 0;
+        $found++ if $_ == any( @L ) for $_.comb;
+        @LL.push: $_ if $_.comb.elems == $found;
+    }
+
+    say @LL.join( ', ' );
+}