function slugify(values) {
  /*
   * Convert the the vs in a range of cells into slugs.
   */
  slugs = [];
  
  for (var row = 0; row < values.length; row++) {
    var bits = [];
    
    for (var column = 0; column < values[row].length; column++) {
      var value = values[row][column];
      
      value = value.toLowerCase();
      value = value.replace(/[^\w\s-]/g, '');
      value = value.replace(/\s+/g, '-');
      
      bits.push(value);
    }
    
    var base = bits.join('-');
    
    var i = 1;
    var slug = base;
    
    while (slugs.indexOf(slug) >= 0) {
      i++;
      slug = base + '-' + i;
    }
    
    slugs.push(slug);
  }
  
  output = [];
  
  for (var s = 0; s < slugs.length; s++) {
    output.push([slugs[s]]);
  }
  
  return output;
}

function test() {
  /*
   * Test the slugify function.
   */
  var TESTS = [
    ['foo', 'baz bing'],
    ['bar', 'BAZ'],
    ['FOO', 'baz-bing']
  ];
  
  var RESULTS = [
    'foo-baz-bing',
    'bar-baz',
    'foo-baz-bing-2'
  ];
  
  var output = slugify(TESTS);
  
  for (var t = 0; t < TESTS.length; t++) {
    var test = TESTS[t];
    var result = RESULTS[t];
                         
    Logger.log("[" + test + "] == " + result);
    Logger.log((output[t][0] == result) + " ... " + output[t][0]);
  }
}