static void Main(string[] args)
{
string parsedString = @"\to ((P\supset Q)\supset P)\supset P";
var inputStream = new AntlrInputStream(parsedString);
var lexer = new FormulaLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
var parser = new FormulaParser(commonTokenStream);
var listener = new FormulaListener();
parser.AddParseListener(listener);
var graphContext = parser.equation();
To to = (To)listener.getTree();
Console.WriteLine(to.getDebugString());
Console.WriteLine(to.getString());
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Proof proof = new Proof(to);
Console.WriteLine("Input: " + parsedString);
Console.WriteLine("Proof: " + proof.getProof());
Console.ReadKey();
}