premise: A man dressed in a surfing shirt and blue and white shorts skillfully guides his yellow board with its multicolored sail over the crest of an ocean wave, flipping over in the process.
hypothesis: a man has surfed for an hour
explanation_1: There's no way of knowing that the surfer has been surfing for an hour.
explanation_2: There is no way to determine how long the man dressed in surfing shirt and blue and white shorts has surfed for an hour.
explanation_3: No way to know that he has surfed for an hour.
premise_logic: exists e1 e3 e2 s1 s2 s3 s4 s5 s6 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12.(n_process(x12) & n_crest(x9) & for(e2,e3) & a_over(s6) & Manner(e3,s6) & in(e3,x12) & Actor(e3,x1) & v_flip(e3) & a_skillfully(s5) & Manner(e2,s5) & with(e2,x8) & over(x8,x9) & of(x9,x10) & n_wave(x10) & of(x10,x11) & n_ocean(x11) & n_sail(x8) & a_multicolored(s4) & Theme(s4,x8) & of(x8,x1) & n_thing(x1) & Theme(e2,x7) & Actor(e2,x1) & v_guide(e2) & n_board(x7) & a_yellow(s3) & Theme(s3,x7) & of(x7,x1) & n_male(x1) & in(e1,x3) & subset_of(x6,x3) & n_shorts(x6) & a_white(s2) & Theme(s2,x6) & a_blue(s1) & Theme(s1,x6) & subset_of(x4,x3) & n_shirt(x4) & of(x4,x5) & n_surfing(x5) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists e1 x1 x2.(for(e1,x2) & n_hour(x2) & Actor(e1,x1) & v_surf(e1) & n_man(x1))