A group poses for a picture in front of a frozen waterfall.
A group acting naturally unaware of the camera.
If a group poses then they are not acting naturally.
exists e1 s1 x1 x2 x3 x4.(for(e1,x2) & in(x2,x3) & of(x3,x4) & n_waterfall(x4) & a_frozen(s1) & Theme(s1,x4) & n_front(x3) & n_picture(x2) & Actor(e1,x1) & v_pose(e1) & n_group(x1))
exists e1 s1 x1 x2 x3 x4.(n_camera(x4) & a_topic(x1) & r_naturally(s1) & of(s1,x4) & Theme(s1,x3) & a_unaware(s1) & (x1 = x3) & Actor(e1,x2) & v_act(e1) & (x1 = x2) & n_group(x1))