Need help with tbl

[Randall Hake]

Using Interactive System V.3.2/386, I am unable to get the tbl command
to work with entries such as

     tbl -TX tbl.file
or
     mm -t -Tlp tbl.file

The following error message pops up in either case:

     usage: /usr/bin/tbl [-T X] [--] [file] ... [-]

That error message is also produced by the command tbl with no
arguments.

Can anyone tell me how to get tbl to work? Thanks.