Some people are walking on a walkway in front of a mural on the side of a building.
The people are sitting at a table
The people cannot be walking and sitting simultaneously.  A walkway is not a table.
exists e1 x1 x2 x3 x4 x5 x6.(n_side(x5) & in(e1,x3) & of(x3,x4) & on(x4,x5) & of(x5,x6) & n_building(x6) & n_mural(x4) & n_front(x3) & on(e1,x2) & n_walkway(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2.(n_people(x1) & at(e1,x2) & n_table(x2) & Actor(e1,x1) & v_sit(e1))