A woman checks her cellphone while sitting at a table with another woman.
A woman is at lunch with her friend.
A woman can be sitting at a table with another woman does not imply that the woman is at lunch or the other woman is her friend.
exists e1 e2 x1 x2 x3 x4.(while(e1,e2) & with(e2,x4) & n_woman(x4) & -(x4 = x1) & n_woman(x1) & n_woman(x1) & at(e2,x3) & n_table(x3) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_check(e1) & n_cellphone(x2) & of(x2,x1) & n_female(x1))
exists p1 x1 x3.(exists x2.(at(x1,x2) & with(x2,x3) & n_lunch(x2)) & n_friend(x3) & of(x3,x1) & n_female(x1) & n_woman(x1))