premise: A man in a blue shirt and tan shorts has his feet in the steps of an exercise bicycle and is working on the control panel of the machine.
hypothesis: There is  no man
explanation_1: There can either be a man or no man - not both.
explanation_2: When there is a man in blue shirt, it cannot be said that there is no man.
explanation_3: They refer to a man.
premise_logic: exists e2 e1 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15.(n_machine(x15) & n_panel(x13) & of(x13,x14) & n_control(x14) & n_step(x6) & on(e2,x13) & of(x13,x15) & Actor(e2,x9) & v_work(e2) & in(x9,x10) & subset_of(x12,x10) & n_shorts(x12) & a_tan(s4) & Theme(s4,x12) & subset_of(x11,x10) & n_shirt(x11) & a_blue(s3) & Theme(s3,x11) & n_man(x9) & Theme(e1,x5) & Actor(e1,x1) & v_have(e1) & in(x5,x6) & of(x6,x7) & n_bicycle(x7) & of(x7,x8) & n_exercise(x8) & n_foot(x5) & of(x5,x1) & n_male(x1) & in(x1,x2) & subset_of(x4,x2) & n_shorts(x4) & a_tan(s2) & Theme(s2,x4) & subset_of(x3,x2) & n_shirt(x3) & a_blue(s1) & Theme(s1,x3) & n_man(x1))
hypothesis_logic: exists p1 x1.-exists x2.((x1 = x2) & n_man(x2))