Construct a three-sided surface in Gambit

User

I used to construct in Gambit the 3D four-sided face using the journal file

face create vertices "vertex.1" ..... ... "vertex.N" rowdimension Ndim

This generate my surface patches correctly.

Now I have some degenerate faces (e.g, three sided faces) but defined as a four-sided faces with coincident points (says the first row).

In this case gambit don't construct the face and prompts that some points are coincident.

The question is : How to construct the three-sided faces using this kind of definition ?

Thanks a lot