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Pig >> mail # user >> Problem in understanding UDF COUNT

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Problem in understanding UDF COUNT
a = load '/user/hue/word_count_text.txt';
b = foreach a generate flatten(TOKENIZE((chararray)$0)) as word;
c = group b by word;
d = foreach c generate COUNT(b), group;

I want to know what would be the input to the udf COUNT in this
case.Also what is the meaning of b being passed as an arguement.

Also I am still not clear acout how count operates.