�{B\=light_on},D │{D#>0}) :-
                                       <ul>
                                         <li> 
                                           forall(C1,forall(D1,not o_c_holdsAt2(B │{B\=light_on},D │{D#>0},C1,D1))) :-
                                           <ul>
                                             <li> 
                                               forall(D1,not o_c_holdsAt2(B │{B\=light_on},D │{D#>0},E1 │{E1#>0},D1)) :-
                                         