ӣţţô  ţţ  ţţֱ  ţţ  ţţ  ţţ  ţţ½  ţţ  ţţ  ţţͼ  ţţ  ţţ  ţţ  ţţ  ţţ  ţţ  ţţ  ţţ  ţţֱ  ţţ