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/region/REGION
/category/CATEGORY
/region/REGION/....
/category/CATEGORY/...

sub load_region : Chained('/') : PathPart('region') : CaptureArgs(1) {
        ...
...
sub view_category : Chained('load_category') : PathPart('') : Args(0) 
+{
        ...
}

sub load_region : Chained('/') : PathPart('') : CaptureArgs(1) {
...
...
sub view_region : Chained('load_region') : PathPart('') : Args(0) {
...
}