var bigrams_en = {
  '^': 'AAABBBCCCDDDEEFFFGGGHHHIIJJKKLLLMMMNNNOOOPPPQRRRSSSTTTUUVVVWWZZ',
  'A': 'BBBCCCDDDEFFGGGHHHIJKKKLLLMMMNNNPPPQRRRSSSTTTVVVWXZ',
  'B': 'AAACDDEEEFHIIILLLNNNOOOPRRRSSSTUUVVYZ',
  'C': 'AAACDEEEGHHHHHHHHIIKKKKKKKLLLMMNNOOOPQRRRTTTTUUV',
  'D': 'AAADEEEHIIIOOORRRSSTTUUUVVY',
  'E': 'AAABBBCCCDDDEFFFGGGHIJLLLMMMNNNOPPPQQQRRRSSSTTUUUVWXXXZ',
  'F': 'AAAEEEFIIIKLLLOOORRRTTUUU',
  'G': 'AAABCDEEEFGGHHHHIIILLLNNNOOORRRTUUUVVWY',
  'H': 'AAAEEEIIIKKKLLLMOOORSTYY',
  'I': 'AABBBCCCDDDEFGGGLLLMMMNNNOOPPPQRRRSSSTTTUUUVZ',
  'J': 'AAAEEEHHHIOOOUUU',
  'K': 'AAEEEHHIIILMMNOOORRSTVV',
  'L': 'AAABDDEEEFGHIIIKKKLLMNOOOPSTTTUUUVYY',
  'M': 'AAABEEEIIIKMNNOOOPPPQRRRSSSTUUUYY',
  'N': 'AAACDEEEFGIIJKLMNNOOOPQRRSSTTUUVVY',
  'O': 'ABBCCCDDDEFFFGGGHKLLMMMNNNOPPPRRRSSSTVVWWZZ',
  'P': 'AAADEEEHHHHHHIIILLLOOOPRRRSSTTUVY',
  'Q': 'UUUVVVY',
  'R': 'AAACCCDDDEEEGGGHHHIIIKKKLMMMNNNOOOPQRSSSTTTUVYZ',
  'S': 'AAABBCCDEEEGHHHHHHHHHHHHHHHHHIIIKKKLLLMMNNOOOPPPQQRSSTTTTTTUVWWWY',
  'T': 'AAACEEEHHHHHHHHHHIIIKKLMNOOORRRRTUUU',
  'U': 'AACCDDDEEEGGHIIKLLLMMMNOOPPPQRRSSTT',
  'V': 'AAABCDEEEGHIIIKLLOOORU',
  'W': 'AAEEEHHHHHIIIOOORRRST',
  'X': 'EEEIIPPPQQQTTT',
  'Y': 'AEEEILLLOOORRRSX',
  'Z': 'AIIIMMMOOOZ',
}
var vowels_en = 'AEIOUY';

function generateCode_old(locale) {
  var bigrams = locale == bigrams_en;
  var vowels = locale == vowels_en;

  var len = 6;
  var code = bigrams['^'][Math.floor(Math.random() * bigrams['^'].length)];
  var prev = code;
  var prevVowel = vowels.indexOf(prev) > -1;
  var run = 1;
  for (var i = 0; i < len; i++) {
    var next, nextVowel, done;
    do {
      next = bigrams[prev][Math.floor(Math.random() * bigrams[prev].length)];
      nextVowel = vowels.indexOf(next) > -1;
      done = true;
      if (prevVowel == nextVowel) {
        // 4 гласных или согласных подряд: запретить совсем
        if (run >= 3) {
          done = false;
        } else
        // 2 одинаковых гласных + гласная, 2 одинаковых согласных + согласная
        if ((run >= 2) && (prev == code[code.length - 2])) {
          done = false;
        } else
        // 3 гласных подряд
        if ((run >= 2) && prevVowel) {
          done = false;
        } else
        // 3 согласных подряд: запретить в 66% случаев
        if ((run >= 2) && (Math.random() > 0.333)) {
          done = false;
        }
      }
    } while (!done);
    code += next;
    prev = next;
    if (prevVowel == nextVowel) {
      run++;
    } else {
      prevVowel = nextVowel;
      run = 1;
    }
  }

  return code;
}