From: New Family of 3-DOF UP-Equivalent Parallel Mechanisms with High Rotational Capability
{L i }
MG of {L i }
{R(O, i)}{R(O, j)}{G(s)}
iRjRsRRP, iRjRsRPR, iRjRsPRR, iRjRsRRR, ijUsRRP, ijUsRPR, ijUsPRR, ijUsRRR