Hi, I am an undergraduate student. I am interested in Alliance. There is one problem I can't figure out. The pattern matching with the structural description file always gives error.i.e asimut <vst> <pat> <out_pat> But asimut -b <vbe> <pat> <out_pat> is ok. After that I do bop ,scmap then if I try to match the vst file all the pattern gives error. For structural pattern match do I need to change pattern file. Hope to hear from you soon. Mohammad Iftekhar Alam