Create a twisted box cage between four edges.

Input parameters:

1. Fl → Edge in cage W direction at $(u,v)$ = (0,0).
2. Fr → Edge in cage W direction at $(u,v)$ = (1,0)
3. Bl → Edge in cage W direction at $(u,v)$ = (0,1)
4. Br → Edge in cage W direction at $(u,v)$ = (1,1)
5. Du → Degree in cage U direction, between 1 and 7.
6. Dv → Degree in cage V direction, between 1 and 7.
7. Dw → Degree in cage W direction, between 1 and 7.

Output parameters:

1. Cg → Twisted box cage between edges.