  A single merger scenario for making galaxies such as NGC 4550 possessing
equal coplanar counter-rotating stellar disks is investigated by collisionless
N-body technique. The scenario is successful in producing an axisymmetric disk
made of two almost equal counter-rotating populations. The final disk shows a
clear bimodal line profile in the outer part, which demonstrates that disk-disk
mergers do not always produce ellipticals.
