| Case | Number of closed-loop | Joint types |
| Case 1 | 1 | 1Rs-1Rf-2R, 1Rs-1Rf-1R1P, 1Ps-1Rf-2R, 1Ps-1Rf-1R1P, 1(Rs-Ps)-1Rf-2R, 1(Rs-Ps)-1Rf-1R1P | Case 2 | 1 | 1Rs-2Rf-1R, 1Rs-2Rf-1P, 1Ps-2Rf-1R, 1(Rs-Ps)-2Rf-1R, 1(Rs-Ps)-2Rf-1P | 2 | 2-(1Rs-1Rf-2R), 2-(1Rs-1Rf-1R1P), 2-(1Ps-1Rf-2R), 2-(1Ps-1Rf-1R1P), 2-[1(Rs-Ps)-1Rf-2R], 2-[1(Rs-Ps)-1Rf-1R1P] | Case 3 | 2 | 1(1Rs-1Rf-2R)1(1Rs-2Rf-1R), 1(1Rs-1Rf-2R)1(1Rs-2Rf-1P), 1(1Rs-1Rf-2R)1(1Ps-2Rf-1R)… | 3 | 3-(1Rs-1Rf-2R), 3-(1Rs-1Rf-1R1P), 3-(1Ps-1Rf-2R), 3-(1Ps-1Rf-1R1P), 3-[1(Rs-Ps)-1Rf-2R], 3-[1(Rs-Ps)-1Rf-1R1P] |
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