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(A) Some actual scenes of human–robot cooperation. (B) Standing postures in the experiment: (a) right-backward standing (RBS); (b) back-incline standing (BIS); (c) left-backward standing (LBS); (d) right-leaning standing (RLS); (e) upright standing (URS); (f) left-leaning standing (LLS); (g) right-forward standing (RFS); (h) forward-leaning standing (FLS); (i) left-forward standing (LFS).
