assign (resid  1 and name C)(resid 2 and name N)
       (resid  2 and name CA)(resid 2 and name C) 1 -120 40 2
assign (resid  2 and name C)(resid 3 and name N)
       (resid  3 and name CA)(resid 3 and name C) 1 -120 40 2
assign (resid  4 and name C)(resid 5 and name N)
       (resid  5 and name CA)(resid 5 and name C) 1 -120 40 2
assign (resid  5 and name C)(resid 6 and name N)
       (resid  6 and name CA)(resid 6 and name C) 1 -120 40 2
assign (resid  6 and name C)(resid 7 and name N)
       (resid  7 and name CA)(resid 7 and name C) 1 -120 40 2
assign (resid  9 and name C)(resid 10 and name N)
       (resid 10 and name CA)(resid 10 and name C) 1 -120 40 2
assign (resid 10 and name C)(resid 11 and name N)
       (resid 11 and name CA)(resid 11 and name C) 1 -120 40 2
assign (resid 11 and name C)(resid 12 and name N)
       (resid 12 and name CA)(resid 12 and name C) 1 -120 40 2