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7.3.  The collisions (.col) file

The .col file enumerates all the six-letter form codes that are involved in collisions. Each line has this format:

6 The collision code, invalid because two or more names would abbreviate to that code by the rules.
6 One of the valid codes that has been substituted for the collision code.

Here is an example showing three records from a .col file. These three lines document the collision between three names for code PASSER. The preferred substitute codes are PASINA (for Passerina), PASINE (for “passerine”), and PASR (for Passer):