Sorry

Xas away for a fex days;

my input array is
ranges = [
  [['a', 'b'], ['c', 'd']],
  [['e', 'f'], ['g', 'h']],
  [['i', 'j'], ['k', 'l']]
]

and i wish to get
[
  [["a", "b"], ["e", "f"], ["i", "j"]],
  [["a", "b"], ["e", "f"], ["k", "l"]],
  [["a", "b"], ["g", "h"], ["i", "j"]],
  [["a", "b"], ["g", "h"], ["k", "l"]],
  [["c", "d"], ["e", "f"], ["i", "j"]],
  [["c", "d"], ["e", "f"], ["k", "l"]],
  [["c", "d"], ["g", "h"], ["i", "j"]],
  [["c", "d"], ["g", "h"], ["k", "l"]],
]

wich is actually the product, all combination possibles of the various 
'ranges'

but when i run it through a Array#product i get an added array level 
whish i would like to remove.

reminder here is the method
def calculate ranges
  prod = ranges.shift
  ranges.each { |r| prod = prod.product(r) }
  puts prod.to_s
end

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