}
var nusage = {};
+
for(var par in usage) {
// see if the parent can be added to something.
if (!canTop(par)) {
continue;
}
+
+ for(var dupe in usage) {
+ if (usage[par].join(',') == usage[dupe].join(',')) {
+ usage_left[par] = dupe;
+ }
+ }
+ if (typeof(usage_left[par])) {
+ continue;
+ }
nusage[par] = usage[par];
}