Find top 16 most freq. occurring words greater than 4 characters

simple_histogram.rb

paragraphs.join("\n").split(/\W/)
  .reject { |w| w.size < 4 }
  .map(&:downcase)
  .reduce(Hash.new(0)) { |words, word| words[word] += 1; words }
  .sort { |a, b| a.last <=> b.last }
  .take(16)
  .map(&:first)
  .join(' ')