Top: minimum distance between clones of (87887) 2000 SS286 and (415992) 2002 AT49 during different synodic cycles in the past (each of the asteroids was represented by 1000 clones, and we considered all possible combinations between them). The first deep encounter is well localized at some 7.4 kyr ago, but the subsequent encounters of different combinations of clones are spread in time starting from ≃ 45 kyr ago. Bottom: relative velocity of the clones at the moment of their nearest encounter from the top panel. Importantly, all possible clone combinations have an extremely low relative velocity (≲ 0.18 m s^-1) during their first encounter in the past. The gray solid line at the top shows a distance of 3 R_Hill, while that at the bottom shows V_esc of the parent body. The gray dashed line at the bottom indicates that the 0.18 m s^-1 value is not exceeded by any of the clone pairs during their first encounter.