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G-1010: Try to label your sub blocks.

Minor

Maintainability

Reason

It's a good alternative for comments to indicate the start and end of a named processing.

Example (bad)

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begin
   begin 
      null;
   end;

   begin
      null;
   end;
end;
/

Example (good)

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begin
   <<prepare_data>>
   begin 
      null;
   end prepare_data;

   <<process_data>>
   begin
      null;
   end process_data;
end good;
/