Various kinds of systems like above picture are considered to apply for volleyball.
As the examples,
5-1, 5-2, 5-6, 5-3, 5-5, 5-4 system:
L5-1, L5-2, L5-6, L5-3, L5-5, L5-4 system(L: Service with long trajectory)
J5-1, J5-2, J5-6, J5-3, J5-5, J5-4 system(J: Jump Service)
