gistfile1.txt

#!/usr/bin/env ruby

 a = [ [1,2,3], [2,3,4], [4,5,6] ]

 b = []
 a[0].each do |i|
   a[1].each do |j|
     a[2].each do |k|
       b << [i,j,k]
     end
   end
 end

 puts b.inspect