ӣţţ  ţţ  ţţ  ţţƭ  ţţ  ţţֱ  ţţ  ţţ¼  ţţ  ţţ  ţţֱ  ţţ½  ţţ  ţţע  ţţ  ţţͼ  ţţ½  ţţƻ  ţţ  ţţ½