Ruby thingy

gistfile1.rb

list = [['A', 'B', 'C'], ['A', 'C', 'E'], ['E', 'F', 'D'], ['D', 'A', 'J'], ['E', 'D', 'J']]
freq = {}
list.each do |seq|
	seq.combination(2).each do |combo|
		freq[combo.sort] = (freq[combo.sort] || 0) + 1
	end
end
freq.keys.sort.each do |key|
	puts "#{key.join(', ')}, #{freq[key]}"
end