Draw tapeworms from residues A1 to A10 and A100 and A120, and connect these by a ribbon:
sketch_obj x sk_set tape line 1.5 sk_add a1 a10 sk_add a100 a120 sk_typ ribbon sk_add a10 a100
Make a ball-and-stick object of an object x :
obj x sphe 10 end ske_stick x read radii.o ske_cpk x