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Problem while using merge join

I try to use a merge join for 2 bags. Here is my pig code:
http://pastebin.com/Y9b2UtNk .

But I got this error:

Caused by:
ERROR 1103: Merge join/Cogroup only supports Filter, Foreach, Ascending
Sort, or Load as its predecessors. Found

I think the reason is that there is no sort function or something like
this. But the bags are definitely sorted. How can I do the merge join?