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delete rows in dataframe

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delete rows in dataframe

Beatrice
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Hello! i desperately need some help with R :)
 i have a huge amount of data, in a data frame with 19 columns.
what I need to do is eliminate all the duplicate rows in only two if these 19 columns and I don't know how to do it :(
i have something like this
   a b c d e f g h i l
m 1 2 3 4 5 6 7 8 9
n  4 2 7 4 5 0 8 4 1
o  1 6 4 7 1 0 7 4 2
p  3 5 2 4 5 6 3 2 8


and you can see that there are the same data in column d-e row m-n-p there is the same couple of data 4,5. how can I remove these?
thanks!
Beatrice
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