old_contents: from Reader import Reader
  from WeightCalculatorOne import WeightCalculatorOne
  from KeyValueComposer import KeyValueComposer
  from parse_indices_config import parse_indices_config
  from NextKeyComposer import NextKeyComposer
  from Count import Count
  from Sum import Sum
  from Scan import Scan
  from BackrefMultipleArrayReader import BackrefMultipleArrayReader
  
new_contents: from Reader import Reader
  from Summarizer import Summarizer
  from WeightCalculatorOne import WeightCalculatorOne
  from KeyValueComposer import KeyValueComposer
  from parse_indices_config import parse_indices_config
  from NextKeyComposer import NextKeyComposer
  from Count import Count
  from Sum import Sum
  from Scan import Scan
  from BackrefMultipleArrayReader import BackrefMultipleArrayReader
  
subject: update __init__.py