(eplain.info)Formatting displays

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4.4.1 Formatting displays
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If you want some other kind of formatting, you can write a definition of
your own, analogous to '\leftdisplays'. You need only make sure that
'\leftdisplaysetup' is called at the beginning of every display
(presumably by invoking it in TeX's '\everydisplay' parameter).

   '\leftdisplays' expands the old value of '\everydisplay' before
calling '\leftdisplaysetup', so that any changes you have made to it
won't be lost. That old token list as available as the value of the
token register '\previouseverydisplay'.