he LHS are
predicates to test the data set against, items that match any of the predicates will
be excluded. The RHS is a glue specification, defining the message, to be
entered in the history graph for each predicate. This can refer to grouping variables
variables from the environment and {.excluded} and {.matched} or
{.missing} (excluded = matched+missing), {.count} and {.total} -
group and overall counts respectively, e.g. "excluding {.matched} items
and {.missing} with missing values".</p></dd>


<dt id