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removing last item in a bag
How do I remove the last item in a bag.

For example:

(group_1,{(2012-12-15,a),(2012-12-17,a),(2012-12-23,c)})
I would like to remove the last item so that the following is the result:
(group_1,{(2012-12-15,a),(2012-12-17,a)})