[Paraview] Curious faces

[Fred Fred]

Hello,discovering holes in my polydata surface, I looked at what vtkCell::GetFace() returns and I discovered a curious face:3 41 2
Here is what I get:
cell type is: 11
cell points are:  63: -90 -30 -60  64: -60 -30 -60  70: -90 0 -60  71: -60 0 -60  112: -90 -30 -30  113: -60 -30 -30  119: -90 0 -30  120: -60 0 -30  face 1 ids are: 64 71 113 120
and of course building such a face leads to holes in my dataset.So my question is: how to get valid faces of any 3D cell?
 		 	   		  
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