Something changed in a recent verison of orpie, causing large sections of
its man page, describing the default key bindings and related important
information to no longer render.

For example, the section `EXECUTING BASIC FUNCTION OPERATIONS` currently begins thus:

   EXECUTING BASIC FUNCTION OPERATIONS
       Once  some data has been entered on the stack, you can apply operations
       to that data. For example, '+' will add the last two  elements  on  the
       stack.  By  default,  the following keys have been bound to such opera‐
       tions:

       As a shortcut, function operators will  automatically  enter  any  data
       that  you  were  in the process of entering. So instead of the sequence
       2<enter>2<enter>+, you could type simply 2<enter>2+ and the second num‐
       ber would be entered before the addition operation is applied.

As you might infer from the ":" ending the first paragraph, there is
supposed to be a table there describing the default key bindings. This table
is visible in the web rendering here:

https://manpages.debian.org/buster/orpie/orpie.1.en.html#EXECUTING_BASIC_FUNCTION_OPERATIONS

Also the table data is clearly visible in the orpie.1.gz file shipped, it's
just that it doesn't actually render in the `man` program.

Without this information, it's very hard to use orpie for anything other
than basic arithmetic.