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def is_palindrome(word)
  if word == word.reverse
   "#{ word } is a palindrome."
  else
   "#{ word } is not a palindrome."
 end
end

# Example implementation:
puts is_palindrome("racecar") 
# This would return "racecar is a palindrome."
puts is_palindrome("penis")
# This would return "penis is not a palindrome."