      4 synthesis
      2 this
      2 find
      2 common
      1 try
      1 three
      1 they
      1 stenght
      1 precaution
      1 photocopier
      1 or
      1 more
      1 mean
      1 look
      1 industry
      1 good
      1 extend
      1 experiment
      1 DP
      1 disease
      1 career
      1 can
      1 book
      1 barket
