[R] permutations in R

[onyourmark]

Hi. Does anyone know of a function which will take as input a number n (or a
let of n letters) and will give out, one at a time, the permutations of n
(or of those n letters) as a vector?
So that I can use the permutations one at a time. And such that it will
exhaust all the permutations with no repeats.

For example if n is 3, I would want a function which I could use in a loop
and the first time I use it in the loop it may give the vector 
123
and then the next time in the loop it may give
132
and so on so that after 6 iterations through the loop I would get all 6
permutations of 123.

Thank you.
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