1. Describe a situation in which the "pattern representation" can make clustering impossible.
2. Describe a situation in which "pattern representation" can make clustering trivial.
3. Define the following terms in the context of pattern proximity:
   1. 1-norm
   2. 2-norm
   3. infinity-norm
   4. hamming distance
   5. Euclidean distance
   6. cosine similarity
   7. Mahalanobis distance