var all_answers = "35145313131213425511543332541354422433115343441231541125342225531";
var all_maxAnswers = "55555555555555555555555555555555555555545555555555555555555555555";
var all_instruction = "00000000000000000000000000000000000000000000000000000000000000000";
var all_explain = "00000000000000000000000000000000000000000000000000000000000000000";
var all_choice = "99999999999999999999999999999999999999999999999999999999999999999";
var currentQuestion = 0;
reference = new Array("Sec. 1.5","Sec. 1.2","Sec. 1.4","Sec. 1.5","Sec. 1.4","Sec. 1.5","Sec. 1.2","Sec. 1.2","Sec. 1.2","Sec. 1.4","Sec. 1.2","Sec. 1.2","Sec. 1.4","Sec. 1.3","Sec. 1.5","Sec. 1.3","Sec. 1.4","Sec. 1.4","Sec. 1.6","Sec. 1.3","Sec. 2.5","Sec. 2.7","Sec. 2.6","Sec. 2.4","Sec. 2.7","Sec. 2.8","Sec. 2.8","Sec. 2.5","Sec. 2.7","Sec. 2.5","Sec. 2.3","Sec. 2.3","Sec. 2.3","Sec. 2.2","Sec. 2.7","Sec. 2.5","Sec. 2.2","Sec. 2.3","Sec. 2.8","Sec. 3.3","Sec. 3.7","Sec. 3.3","Sec. 3.4","Sec. 3.4","Sec. 3.3","Sec. 3.2","Sec. 3.1","Sec. 3.7","Sec. 3.4","Sec. 3.7","Sec. 3.4","Sec. 3.5","Sec. 3.2","Sec. 3.5","Sec. 3.4","Sec. 3.6","Sec. 3.4","Sec. 3.6","Sec. 3.7","Sec. 3.4","Sec. 3.3","Sec. 4.4","Sec. 4.2","Sec. 21.4","Sec. 21.1");