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1. A massive nuclear explosion, properly placed, suitably directed, and suitably timed, was expected to perform the Comet Dutta operation.
   
 
2. It was agreed to keep Comet Dutta's idea a secret until the project was completed.
   
 
3. Project Dutta was the name given to Comet Dutta's operation.
   
 
4. The experts already determined that the collision of Comet Dutta was avoidable.