premise: A person in a yellow helmet rock climbing while another person waits on the ground with the tether.
hypothesis: The helmet is black.
explanation_1: The helmet cannot be black if it is yellow.
explanation_2: The helmet cannot be yellow and black simultaneously.
explanation_3: One says the helmet is yellow, the other says it is black.
premise_logic: exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_tether(x8) & n_ground(x7) & a_topic(x1) & in(x1,x2) & with(e1,x8) & on(e1,x7) & while(e1,x5) & Time(x5,x6) & n_wait(x6) & n_person(x5) & -(x5 = x1) & n_person(x1) & n_person(x1) & Actor(e1,x4) & v_climb(e1) & (x2 = x4) & n_rock(x2) & of(x2,x3) & n_helmet(x3) & a_yellow(s1) & Theme(s1,x2))
hypothesis_logic: exists s1 x1.(n_helmet(x1) & Theme(s1,x1) & a_black(s1))