code: @Test public void literalWithTwoAccolades() throws ScanException {
    Tokenizer tokenizer=new Tokenizer("%x{y} %a{b} c");
    Parser parser=new Parser(tokenizer.tokenize());
    Node node=parser.parse();
    Node witness=new Node(Node.Type.LITERAL,"%x");
    Node t=witness.next=new Node(Node.Type.LITERAL,"{");
    t.next=new Node(Node.Type.LITERAL,"y");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL,"}");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL," %a");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL,"{");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL,"b");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL,"}");
    t=t.next;
    t.next=new Node(Node.Type.LITERAL," c");
    node.dump();
    System.out.println("");
    assertEquals(witness,node);
  }
  