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fill 30 put in 50公仔箱論壇0 V+ f9 F1 }/ o3 i/ h) m) M
fill 30 put in 50  now 10 in 30
9 a$ u- X4 M$ z5 d- d公仔箱論壇empty 50  put the 10 in
6 i( i% O) N- o0 |" F. Atvb now,tvbnow,bttvbfill 30 put in 50=40