Never underestimate the value of data structures.
Give LabResult a pointer to the next (or previous)
LabResult.  Then the rule becomes more comprehensible:

$l1 : LabResult( value < 1, eval( inLastMonth(date) )
$l2 : LabResult( value < 1, eval( inLastMonth(date),
next == $l1 )
$l3 : LabResult( value < 1, eval( inLastMonth(date),
next == $l2 )

It's also more easily extensible to longer sequences.

GreG

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