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Postings from January 2002
> We do need to figure out whether KEEP and UNDO are
> simply LAST variants or if they also fire off when NEXT
> fires off.
Someone earlier mentioned combining blocks:
LAST and KEEP { ... }
with the semantics being that a given block only gets executed
if its guard is true, and each block by default executing quite
permissively, ie KEEP executing on every NEXT.
--me
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