How I can get the last tuple of a bag

[李运田]

I have data like :
(lucy,{(34,,45),(34,,45),(34,,45),(34,,45),(34,,45),(34,,45),(34,,45),(34,,45),(34,,45)})
(lili,{(12,lili,23),(12,lili,23),(12,lili,23),(12,lili,34),(12,lili,23),(12,lili,89),(12,lili,23),(12,lili,23),(12,lili,23),(12,lili,34),(12,lili,23),(12,lili,89),(12,lili,23),(12,lili,23)})
(limaomao,{(,limaomao,56),(,limaomao,56),(,limaomao,56),(,limaomao,56),(,limaomao,56),(,limaomao,56),(,limaomao,56),(,limaomao,56),(,limaomao,56)})
its metadata is: t2: {group: chararray,t1: {(a: int,b: chararray,c: int)}}
I can get first tuple of t1 using limit or FirstTupleFromBag.html .But, How I 
can get every last tuple of  t1.
thanks