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 Documented in Volume 1 of the UNIX Programmers Manual.

 % soelim exum?.n | tbl | nroff -ms | col | pr
  will include text for embedded .so lines in the files named exum?.n,
  and pass the resulting expanded nroff script to tbl (then to nroff then
  to col then to pr.  The soelim program is handy because programs such as
  tbl do not normally expand the text from .so lines.

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