draw_something.rb

unless ARGV.size == 2
  puts "USAGE: ruby guess.rb ACKRCKOOLCWZ 5"
  exit 1
end

letters = ARGV[0]
limit = ARGV[1]

words = Hash.new { |h, word| h[word] = false }

File.open("/usr/share/dict/words") do |file|
  file.each do |line|
    words[line.strip.downcase] = true
  end
end

guesses = []
letters.downcase.split(//).permutation(limit.to_i).to_a.each do |permutation|
  guess = permutation.join
  guesses << guess if words[guess]
end

guesses.uniq.each do |guess|
  puts guess
end