formulas(sos). all p (Proposition(p) -> Property(VAC(p))). all x all p ((Object(x) & Proposition(p)) -> (Encp(x,p) <-> (exists F (Property(F) & F=VAC(p) & Enc(x,F))))). 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 p all x ((Object(x) & Proposition(p)) -> (TrueIn(p,x) <-> Encp(x,p))). all x (Object(x)-> (Maximal1(x)<->Situation(x)& (all p (Proposition(p)->TrueIn(p,x)|TrueIn(NEG(p),x))))). exists x (Object(x) & Ex1At(A,x,W) & (all F (Property(F) -> (Enc(x,F) <-> (exists p (Proposition(p) & F=VAC(p))))))). end_of_list.