[R] how to order each element according to alphabet

[onthetopo]

> dd
     [,1] [,2]
[1,] "OP" "SU"
[2,] "XA" "YQ"

sapply( lapply(
+ strsplit(dd, split=""), sort),
+ paste, collapse="")

[1] "OP" "AX" "SU" "QY"

The result is not what I intended since it is a single line. 
It should be:
     [,1] [,2]
[1,] "OP" "SU"
[2,] "AX" "QY"

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