Convert in less than 30 lines

gistfile1.txt

Question: Convert following into the latter data structure in less than 30 lines:

List:
  A, B, C
  A, C, E
  E, F, D
  D, A, J
  E, D, J

List
  A, B, 1 (frequency)
  A, C, 2
  A, D, 1
  A, E, 1
  A, J, 1
  B, C, 1
  C, E, 1
  D, E, 2
  D, F, 1
  D, J, 2
  E, F, 1
  E, J, 1

solution.rb

require "pp"
initialList = [["A", "B", "C"], ["A", "C", "E"], ["E", "F", "D"], ["D", "A", "J"], ["E", "D", "J"]]
finalList = Hash.new(0)

initialList.each do |r| 
	r.combination(2).each do |c|
    finalList[c.sort] += 1
	end
end
pp finalList