A number of people are gathered in a plaza at the foot of the steps to a building.
a group of people are dancing.
The people can not be gathered and dancing at the same time.
exists e1 x1 x2 x3 x4 x5 x6.(n_step(x5) & n_foot(x4) & at(e1,x4) & of(x4,x5) & to(x5,x6) & n_building(x6) & in(e1,x3) & n_plaza(x3) & Theme(e1,x1) & v_gather(e1) & of(x1,x2) & n_people(x2) & n_number(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_dance(e1) & of(x1,x2) & n_people(x2) & n_group(x1))