[R] Sorting strings

[statquant2]

Hi all, I am having difficulties to understand how R sort strings:

If I do
R) sort(c("X.","X0B"))
[1] "X."  "X0B"

So for me, as far as lexicographic order is concerned I can add whatever to
the end, the order will remain the same, but :
R) sort(c("X.Z","X0B.Z"))
[1] "X0B.Z" "X.Z"

Can somebody give me a trick for the order to become lexicographic ?  



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