[R] Does it exist a function for this?

[lunarossa]

I have this kind of matrix, with thousands of cases. 

A 2 apple 
A 2 peach 
A 3 peach 
B 1 pear 
B 4 peach 
B 4 beef 
B 7 beef 
C 1 peach 
D 2 apple 
D 5 peach 

I have to distinguish, from the other rows, the rows with "peach" and this
is not a problem. 

I also have to discriminate the rows with peach like the second one
(associated with the same two cells "A" and "2" to "apple", see first row)
from the row like the 3rd or the 8th ones, when the first two cells are
"unique" ("A" and "3" or "C" and "1").

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