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can be located in the master key describing the block information, a 

 rod run through the proper hole, and the cards punched for that hole 

 fall loose and deliver that data. The major advantages of the system 

 are the capability for easily transporting the entire deck, the 

 elimination of alphabetization and cross indexing, and the ability, 

 with a modest amount of hand sorting, to group and regroup the data 

 in any desired way. 



