Program: 46791
Project: 46791
Buggy source:
public final Formula facts(){
  final Variable v=Variable.unary("String_Node_Str");
  final Variable w=Variable.unary("String_Node_Str");
  final Variable e=Variable.unary("String_Node_Str");
  final Variable d=Variable.unary("String_Node_Str");
  final Variable n=Variable.unary("String_Node_Str");
  final Variable st=Variable.unary("String_Node_Str");
  final Variable en=Variable.unary("String_Node_Str");
  final Variable x=Variable.unary("String_Node_Str");
  final Variable x2=Variable.unary("String_Node_Str");
  final Formula f0=v.join(next).eq(w);
  final Formula f1=v.join(ref).eq(e);
  final Formula f2=w.join(ref).eq(d);
  final Formula f3=d.join(begin).eq(e.join(end));
  final Formula f4=f0.and(f1).and(f2).implies(f3);
  final Formula f5=f4.forAll(v.oneOf(Visit).and(w.oneOf(Visit)).and(e.oneOf(Edge)).and(d.oneOf(Edge)));
  final Formula f6=v.in(w.join(next.reflexiveClosure()));
  final Formula f7=w.in(v.join(next.closure())).not();
  final Formula f8=f6.iff(f7).forAll(v.oneOf(Visit).and(w.oneOf(Visit)));
  final Formula f9=v.join(ref.join(begin)).eq(Start);
  final Formula f10=w.in(v.join(next.reflexiveClosure()));
  final Formula f11=f9.and(f10);
  final Formula f12=f11.forSome(v.oneOf(Visit)).forAll(w.oneOf(Visit));
  final Formula f13=v.join(ref.join(end)).eq(Finish);
  final Formula f14=v.in(w.join(next.reflexiveClosure()));
  final Formula f15=f13.and(f14);
  final Formula f16=f15.forSome(v.oneOf(Visit)).forAll(w.oneOf(Visit));
  final Expression reachableFromN=(n.join(((begin.transpose()).join(end)).closure()));
  final Expression nodeb4N=(n.join(end.transpose())).join(begin);
  final Formula f17=n.in(reachableFromN);
  final Formula f18=(nodeb4N.in(reachableFromN)).not();
  final Formula f19=n.in(start_loop);
  final Formula f20=(f18.and(f17)).iff(f19);
  final Formula f21=f20.forAll((n.oneOf(Node)));
  final Expression begEnd=((begin.transpose()).join(end)).closure();
  final Expression nextNodeN=(((n.join(begin.transpose())).join(end)));
  final Formula f27=n.in(n.join(begEnd));
  final Formula f28=n.in(loop_set);
  final Formula f29=f27.iff(f28);
  final Formula f30=f29.forAll(n.oneOf(Node));
  final Formula f31=x.in(start_loop);
  final Formula f32=n.in(end_loop);
  final Formula f33=x.in(nextNodeN);
  final Formula f34=x.product(n).in(corresp);
  final Formula f35=f34.iff(f33.and(f32).and(f31));
  final Formula f36=f35.forAll(n.oneOf(Node).and(x.oneOf(Node)));
  final Formula f38=st.in(nextNodeN);
  final Formula f40=n.in(end_loop);
  final Formula f39=st.in(start_loop);
  final Formula f41=f40.iff(f38.and(f39));
  final Formula f42=f41.forAll(n.oneOf(Node).and(st.oneOf(Node)));
  return f5.and(f8).and(f12).and(f16).and(f21).and(f30).and(f36).and(f42);
}

Fixed version (ground truth):
public final Formula facts(){
  final Variable v=Variable.unary("String_Node_Str");
  final Variable w=Variable.unary("String_Node_Str");
  final Variable e=Variable.unary("String_Node_Str");
  final Variable d=Variable.unary("String_Node_Str");
  final Variable n=Variable.unary("String_Node_Str");
  final Variable st=Variable.unary("String_Node_Str");
  final Variable en=Variable.unary("String_Node_Str");
  final Variable x=Variable.unary("String_Node_Str");
  final Variable x2=Variable.unary("String_Node_Str");
  final Formula f0=v.join(next).eq(w);
  final Formula f1=v.join(ref).eq(e);
  final Formula f2=w.join(ref).eq(d);
  final Formula f3=d.join(begin).eq(e.join(end));
  final Formula f4=f0.and(f1).and(f2).implies(f3);
  final Formula f5=f4.forAll(v.oneOf(Visit).and(w.oneOf(Visit)).and(e.oneOf(Edge)).and(d.oneOf(Edge)));
  final Formula f6=v.in(w.join(next.reflexiveClosure()));
  final Formula f7=w.in(v.join(next.closure())).not();
  final Formula f8=f6.iff(f7).forAll(v.oneOf(Visit).and(w.oneOf(Visit)));
  final Formula f9=v.join(ref.join(begin)).eq(Start);
  final Formula f10=w.in(v.join(next.reflexiveClosure()));
  final Formula f11=f9.and(f10);
  final Formula f12=f11.forSome(v.oneOf(Visit)).forAll(w.oneOf(Visit));
  final Formula f13=v.join(ref.join(end)).eq(Finish);
  final Formula f14=v.in(w.join(next.reflexiveClosure()));
  final Formula f15=f13.and(f14);
  final Formula f16=f15.forSome(v.oneOf(Visit)).forAll(w.oneOf(Visit));
  final Expression reachableFromN=(n.join(((begin.transpose()).join(end)).closure()));
  final Expression nodeb4N=(n.join(end.transpose())).join(begin);
  final Formula f17=n.in(reachableFromN);
  final Formula f18=(nodeb4N.in(reachableFromN)).not();
  final Formula f19=n.in(start_loop);
  final Formula f20=(f18.and(f17)).iff(f19);
  final Formula f21=f20.forAll((n.oneOf(Node)));
  final Expression begEnd=((begin.transpose()).join(end)).closure();
  final Expression nextNodeN=(((n.join(begin.transpose())).join(end)));
  final Formula f27=n.in(n.join(begEnd));
  final Formula f28=n.in(loop_set);
  final Formula f29=f27.iff(f28);
  final Formula f30=f29.forAll(n.oneOf(Node));
  final Formula f31=x.in(start_loop);
  final Formula f32=n.in(end_loop);
  final Formula f33=x.in(nextNodeN);
  final Formula f34=x.product(n).in(corresp);
  final Formula f35=f34.iff(f33.and(f32).and(f31));
  final Formula f36=f35.forAll(n.oneOf(Node).and(x.oneOf(Node)));
  Formula f100=x.in(nextNodeN);
  Formula f101=st.in(nextNodeN);
  Formula f102=st.in(n.join(begEnd));
  Formula f103=(st.in(x.join(begEnd))).not();
  Formula f104=n.in(end_loop);
  Formula f105=f104.implies(f103.and(f102).and(f101).and(f100));
  Formula f106=f105.forAll(n.oneOf(Node).and(st.oneOf(start_loop).and(x.oneOf(Node))));
  return f5.and(f8).and(f12).and(f16).and(f21).and(f30).and(f36).and(f106);
}