V10/cmd/library/README.opt1

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Option 1 reads the file known.list for acceptable number sequences.
Note that these are written in standard regular expression format.

PLEASE NOTE - all option 1 requests go to and are handled by the
AT&T Library Network.  There is no point in making the library command
(that is the executable library) accept more sequences if the
AT&T Library Network will not handle the requests or recognize the
sequences.