faces inside out after export

 From:  urban_h
4729.1 
Hi !

When I use Network command to create Surface and export it as OBJ to Cinema4D
I get some faces inside out. How to avoid that ?

I did all surface's in same order when I select them in MOI , left , top , right , bottom in each square , so idon't understand why its flip in Cinema 4D

/ urban
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