hw not uploaded properly

gistfile1.txt

dirty_words = ['pee', 'poop', 'she-dog', 'phallus', 'fornicate', 'frack']

#prompt user to say bad words
puts "Go ahead, say your worst:"

#accept an input sentence, making sure to make input_phrase lower case
input_phrase = gets.chomp.downcase

#creat an array of words from input_sentence
user_words = input_phrase.split()

#is there an intersection between the two arrays?
a = user_words & dirty_words

#a will return the dirty words that match, but will return nil if no intersection


#this is where I get caught up....if the intersection is not nil that means there are dirty words
if a != []
  puts "We're rejecting that, you potty mouth"
else
  puts "Okay, we'll publish that."
end