$tree->fid('solution')->detach unless $args{solution};
$_->detach for $tree->fclass('rc'); # requires contest
$tree->fid('solution_modal')->fclass('modal-body')->replace_content(literal $args{solution});
$tree->fid('solution')->detach unless $args{solution};
$_->detach for $tree->fclass('rc'); # requires contest
$tree->fid('solution_modal')->fclass('modal-body')->replace_content(literal $args{solution});