for my $row (combinations(1..3)) {
   my @row = 1..3;
   $row[$_-1] = "($row[$_-1])" for @$row;
   print "@row\n";
}

# from [id://24270] by [merlyn]
sub combinations {
   return [] unless @_;
   my $first = shift;
   my @rest = combinations(@_);
   return @rest, map { [$first, @$_] } @rest;
}

__END__
1 2 3
1 2 (3)
1 (2) 3
1 (2) (3)
(1) 2 3
(1) 2 (3)
(1) (2) 3
(1) (2) (3)
[download]

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)