The file 97NDCCOL.COD contains the source code published in the Nov/Dec 1997 Computer Column of _The Cryptogram_. This is not a complete program but rather changes to be applied to the Sep/Oct 1997 Computer Column program. The file 97NDCCOL.BAS contains the complete program discussed in the Nov/Dec 97 column after the changes in 97NDCCOL.COD have been made to the Sep/Oct 97 program. The file 97ISSU06.ZIP contains the files in this directory. The .ZIP was created under MS-DOS and the text files are in DOS ascii text format.