NOTE: At time of entry: 



MTYPE(l) = 0, 1=1. NP 



NEXT(!) =0, Ul, NN 



LINK(I) =0, 1=1, NN 



NRANK(l) = 0, 1 = 2, NN 



NRANK(I)= flgeneral case number 

 of a node on center- 

 line if symmetric 



Figure 5c 



35 



