// Author: schuessf@informatik.uni-freiburg.de
// Date: 2023-03-28

PetriNet net = (
  alphabet = {a b},
  places = {p1 p2},
  transitions = {
    ({p1} a {p2}) 
    ({p2} b {p1}) 
  },
  initialMarking = {p1},
  acceptingPlaces = {p2}
);

assert(buchiAccepts(net, [, a b]));