?????q??????,????????,q??????3.6????
3.6????????2?<<<<<<<<<<
3.???????
??????!?????????????~
3??7??6????3??21??6??????????????????9????12?????12????15?????15????18?????
18????21???????????????????!?????????ε????????????????????????????????
???????????????????
q????????????????????????£?
q???????????????????????
q??????????????????????
?????α???LQ??