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DECLARE word
When a formatted RTF file is read, CONGEN will check to see that all components of a residue refer to atoms within that residue, and will issue an informational message if they are not. However, since all polymeric structures will have linkages between residues, there will be atoms which refer outside of each residue.
The DECLARE command informs the program that atoms whose name is word is a linkage atom, and that CONGEN should not issue a message for such messages. Aside from these messages, the DECLARE command is optional.