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

PetriNet net = (
  alphabet = {a b c d},
  places = {p0 p1 p2 p3 p4 p5 p6},
  transitions = {
    ({p1} a {p2 p3 p4}) 
    ({p2 p3 p4} b {p5 p6}) 
    ({p5} c {p2 p3}) 
    ({p6} d {p4}) 
  },
  initialMarking = {p1},
  acceptingPlaces = {p5}
);

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