/*
generate sequence
@param String pattern
@param Number parity
@param Number check
function generateSequence(pattern, parity, check) {
  if (pattern.length !== 6) {
    return null;
  }

  check = parseInt(check);
  parity = parseInt(parity);

  var p = PAIRITYMAP[check][parity],
    seq = START;

  for (var i = 0; i < 6; i++) {
    seq = seq.concat( BARMAP[ p[i] ][ parseInt(pattern[i]) ] );
  }

  return seq.concat(END);
}