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Jul 20th, 2019
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  1. lapply(car_list, function(x) x[,.N,by=speed])
  2.  
  3. [[1]]
  4. speed N
  5. 1: 4 2
  6. 2: 7 2
  7. 3: 8 1
  8. 4: 9 1
  9. 5: 10 3
  10. 6: 11 2
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