The vertical motions of two robots in Figure … They send status at A1 and B1 [start of approach] and check the status of the other at A2, A3, … [where A3 and B3 are wait points]. Assume robot B is in delay to robot A, robot … robot A selects straight trajectory to A3 and … selects the smooth trajectory towards B4 [skipping B3] as it has received status of robot A telling it … of the robots is achieved without halting robot …
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