Customers stand in front of and talk with representatives sitting at desks with computers.
The employees are standing by a display model and showing how to use it.
Customers are not employees, people are standing in front of and talking with others, versus standing by a display and showing how to use the display. The activities are not the same.
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 e2 p1 s1 x1 x2 x3.(n_employee(x1) & Topic(e2,p1) & exists e3.(Theme(e3,x2) & Actor(e3,x1) & v_use(e3)) & n_thing(x2) & a_how(s1) & Manner(e2,s1) & Actor(e2,x1) & v_show(e2) & by(e1,x2) & n_model(x2) & of(x2,x3) & n_display(x3) & Actor(e1,x1) & v_stand(e1))