make_chains.rb

def make_chains(words)
  chains = {}

  for i in 0..words.length-2
    word_1 = words[i]
    word_2 = words[i + 1]
    value = words[i + 2]

   if !chains.include? word_1
      chains[word_1] = {}
    end
    if !chains[word_1].include? word_2
      chains[word_1][word_2] = []
    end

    chains[word_1][word_2] << value
  end
  puts chains
  chains
end