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Which one of the following is $\textbf{NOT CORRECT}$?

  1. nylon$-6,6$ is produced by condensation polymerization
  2. phenol-formaldehyde resin is a thermosetting polymer
  3. high density polyethylene (HDPE) is produced by condensation polymerization
  4. poly (ethylene terephthalate) (PET) is a polyester
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