[R] I need a very specific unique like function and I don't know even how to properly call this

[madr]

consider this matrix:

      [,1] [,2]
 [1,]    3   7
 [2,]    6   5
 [3,]    7   5
 [4,]    3   5
 [5,]    7   5
 [6,]    5   5
 [7,]    8   4
 [8,]    2   4
 [9,]    7   4
[10,]    0   6

I need to delete all rows where column 2 above and below has the same value,
so the effect would be:

      [,1] [,2]
 [1,]    3   7
 [2,]    6   5
 [6,]    5   5
 [7,]    8   4
 [9,]    7   4
[10,]    0   6

is there a built in function for that kind of operation or I must write one
from scratch ?
Is there a name for that kind of operation ?
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