[R] word frequency count

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Hi:

I have a dataframe containing comma seperated group of words such as

milk,bread
bread,butter
beer,diaper
beer,diaper
milk,bread
beer,diaper

I want to output the frequency of occurrence of comma separated words
for each row and collapse duplicate rows, to make the output as shown
in the following dataframe:

milk,bread   2
bread,butter 1
beer,diaper  3
milk,bread   2

Thanks for help!

deb