given d: a data yielder, where d is a sort of
data. Yields the transient data given to its evaluation, provided that the data
is of sort d.
given d #p: a datum yielder, where d is a sort of datum and p is a positive integer. Yields the
p'th component of the transient data given to its evaluation, provided that
the datum is of sort d.
it: a datum yielder. Yields the single datum given to
its evaluation as a transient.
them: a data yielder. Yields all the data given to
its evaluation as transients.
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