Consider the following sentence "I hurt my nail when I was driving a nail into the wall." Which of the following statements is *false*?
1) The sentence has 13 words.
2) The sentence has 12 bigrams (i.e., 12 2-grams).
3) Both occurrences of "nail", with different meanings, are considered the same token.
4) The sentence contains 9 tokens considering only 3+ alphanumeric characters.