public override WS1SFormula ToWS1S(CharSetSolver solver)
 {
     if (WS1S == null)
     {
         WS1S = new WS1STrue();
     }
     return(WS1S);
 }
 internal override Automaton <BDD> getDFA(List <string> variables, BDD alphabet, CharSetSolver solver)
 {
     return(WS1STrue.computeDFA(variables, alphabet, solver));
 }
 public override WS1SFormula ToWS1S(CharSetSolver solver)
 {
     if (WS1S == null)
         WS1S = new WS1STrue();
     return WS1S;
 }