,
  ['car', 'cars', 'automobile', 'automobiles', 'vehicle', 'vehicles'],
  ['water'],
];

var createCheckboxes = function(div){
  var checkboxData = { toclick: {}, clickNames: [] };

  checkboxData.elems = core.randi(2, 7);
  var wordList = SYNONYMS.slice();
  core.shuffle(wordList);
  checkboxData.numToClick = core.randi(1, 6);
  checkboxData.elems = core.randi(Math.max(3, checkboxData.numToClick + 1), 7);
  checkboxData.names = [];
  for(var i=0;i<checkboxData.elems;i++) {
    var chname = core.sample(wor