Customers stand in front of and talk with representatives sitting at desks with computers.
They are complaining about a product defect.
standing and talking doesn't imply that they are complaining about a product defect
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(in(e1,x2) & of(x2,x3) & with(x3,x4) & with(e2,x7) & n_computer(x7) & at(e2,x6) & n_desk(x6) & Actor(e2,x5) & v_sit(e2) & (x4 = x5) & n_representative(x4) & n_talk(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_customer(x1))
exists e1 x1 x2.(about(e1,x1) & n_defect(x1) & of(x1,x2) & n_product(x2) & Actor(e1,x1) & v_complain(e1) & n_thing(x1))