formulas(sos). all x (Situation(x)->Object(x)). all x (Object(x) -> (Situation(x) <-> Ex1At(A,x,W) & (all F (Property(F) -> (Enc(x,F) -> (exists p (Proposition(p) & F=VAC(p)))))))). all x all p ((Object(x) & Proposition(p)) -> (Encp(x,p) <-> (exists F (Property(F) & F=VAC(p) & Enc(x,F))))). all p all x ((Object(x) &Proposition(p)) -> (TrueIn(p,x)<->Encp(x,p))). all x all y ((Object(x) & Object(y)) -> (PartOf(x,y) <-> Ex1At(A,x,W) & Ex1At(A,y,W) & (all F (Property(F) -> (Enc(x,F)->Enc(y,F)))))). end_of_list.