pig 中下面提到的数据的模式应该是什么?

What should be the schema for the data mentioned below in pig?

({(b,c),(d,e)})

我试过:(t1:tuple(B1:Bag{(a:chararray,b:a:chararray)})); 但是运气不好。

正确答案是:(t1:tuple(B1:Bag{t2:tuple(t2a:chararray,t2b:chararray)}))