A group of people are walking down an alleyway.
Everyone is indoors.
One cannot be indoors and in an alleyway simultaneously.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_walk(e1) & n_alleyway(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
all x1.(n_person(x1) -> exists p1 x2.((x1 = x2) & n_indoor(x2)))