$default  = sort($map);
$reverse  = sort($map,  "vr");
$numup    = sort($map,  "vn");
$numdown  = sort($map,  "vnr");
$lexup    = sort($map,  "vf");
$lexdown  = sort($map,  "vfr");
$foldup   = sort($map,  "vc");
$folddown = sort($map,  "vcr");
