replacement colliding can effect tracks to those hydrogen
backsliding is failure. colliding is event. replacing_auto_fuse is replacement_event. colliding is change_of_location. colliding is irreflexive_action. car_tire_replacement is replacement_event. motor_oil_replacement is replacement_event. crossing_over_chromosomal is replacement_event. replacing_tire is replacement_event. colliding_with_obstacle is colliding.