/* Copyright 1995, Columbia University, all rights reserved.
* Permission is granted to utilize and disseminate this code or
* document without charge, provided that (1) this copyright notice is
* not removed, and (2) all changes made by other than members of the
* MacroModel Development Group at Columbia University are, if further
* disseminated, (a) noted as such; for example, by means of source-code
* comment lines, and (b) communicated back to the author for possible
* inclusion in subsequent versions. */
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