(eplain.info)\edefappend

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7.6.2 '\edefappend'
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'\edefappend' is a way of adding on to an existing definition. It takes
two arguments: the first is the control sequence name, the second the
new tokens to append to the definition. The second argument is fully
expanded (in the '\edef' that redefines the control sequence).

   For example:

     \def\foo{abc}
     \def\bar{xyz}
     \edefappend\foo{\bar karl}

results in '\foo' being defined as 'abcxyzkarl'.