premise: Two men, each wearing a white tee-shirt and headphones make adjustments to a machine while shaded by a dark umbrella-like contraption.
hypothesis: Technicians servicing machinery under hastily constructed shade.
explanation_1: Men are not assumed to be technicians servicing machinery.  An umbrella-like contraption is not assumed to be hastily constructed.
explanation_2: Two men wearing a white tee-shirt and headphones making adjustments to a machine does not necessarily mean that technicians are servicing machinery.
explanation_3: Making adjustments to a machine does not necessarily imply they are servicing it. A dark umbrella-like contraption for shade does not imply the shade was hastily constructed.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(by(e1,x7) & n_contraption(x7) & a_umbrella-like(s2) & Theme(s2,x7) & a_dark(s1) & Theme(s1,x7) & while(e1,x6) & n_shade(x6) & Theme(e1,x4) & Actor(e1,x1) & v_make(e1) & to(x4,x5) & n_machine(x5) & n_adjustment(x4) & rel(x1,x2) & subset_of(x3,x2) & n_headphone(x3) & all x8.(n_thing(x8) -> exists e2 s3 x9 x10.(subset_of(x8,x2) & Theme(e2,x10) & Actor(e2,x9) & v_wear(e2) & n_tee-shirt(x10) & a_white(s3) & Theme(s3,x10) & (x8 = x9))) & n_man(x1) & card_eq_2(x1))
hypothesis_logic: exists e1 e2 s1 x1 x2 x3.(ne_nam_technicians(s1) & a_topic(s1) & under(e1,x3) & n_shade(x3) & Theme(e2,x3) & v_construct(e2) & r_hastily(x3) & Theme(e1,x2) & Actor(e1,x1) & v_service(e1) & n_machinery(x2) & (s1 = x1))