premise: Three young men are cleaning up a classroom.
hypothesis: Three young men clean up their class.
explanation_1: Class and classroom are synonyms.
explanation_2: "Cleaning up a classroom" is a rephrase of "clean up their class."
explanation_3: Present continuous " cleaning up "  to present simple " clean up ".
premise_logic: exists e1 s1 s2 x1 x2.(a_up(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_classroom(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_3(x1))
hypothesis_logic: exists e1 s1 s2 x1 x2.(a_up(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_class(x2) & of(x2,x1) & n_thing(x1) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_3(x1))