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As Kanye West said:
We're living the future so
the present is our past.
def get_numbers(list, index = 0, taken = [])
  return [taken] if index == list.size
  get_numbers(list, index+1, taken) +
  get_numbers(list, index+1, taken + [list[index]])
end
get_numbers([1,2,3])
      | Header | Header | Header | Header | 
|---|---|---|---|
| Cell | Cell | Cell | Cell | 
| Cell | Cell | Cell | Cell | 
| Cell | Cell | Cell | Cell | 
| Cell | Cell | Cell | Cell |