[R] permutate elements in a vector

[Wendy]

Hi all, 

I have a vector, e.g., A = c(10, 20, 30, 40). This 4 numbers have 4! = 24
different combination. I want to generate a matrix with one combination in
one row, so the output would be 

B = 
10 20 30 40 
10 40 20 30
... 

Does anyone know how to do this easily in R? Thank you very much.

Wendy 

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