[R] How to make a cartesian pairlist from a vector?

[newbyr]

Hi, 

I'm looking for a function that will take a list of columns or data.frame
and corvert it to cartesian pairlist. For example for this data.frame (see
below), I'd like to get a list of all possible pairs: 

> sound 
  cs rs ns 
  7  5  2 
  4  5  4 
  6  3  1 
  8  4  1 
  6  4  2 
  6  7  1 
  2  2  5 
  9  2  5 

how can I get this? 
> mylist 
  ((cs,rs), (cs,ns), (rs,ns)) 

This list contains a set of all possible combinations of column pairs. 

Thank you for your help.

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