// Author: schuessf@informatik.uni-freiburg.de
// Date: 2023-05-10

PetriNet net = (
  alphabet = {a b c},
  places = {p0 p1 p2 p3},
  transitions = {
    ({p1} a {p2}) 
    ({p2 p0} b {p3}) 
    ({p3} c {p1 p0}) 
  },
  initialMarking = {p0 p1},
  acceptingPlaces = {p0}
);

assert(!buchiIsEmpty(net));