day19, struggling part2, not quite yet

day19/notes.org

@@ -25,3 +25,19 @@ with special cases for "R" and "A"
 
 so. have funciton from OpeartionData & Detail -> true/false
 if true take the destination, if false, check next
+* well. only way to do this is with intervals
+
+so, sorter check takes in interval.
+
+then for each of the rule,
+call first rule with full interval,
+deduct first rule (for those that don't match) and pass to second.
+deduct second and pass to next
+
+A will return full
+R will return empty
+
+and results from each rule application should be joined
+
+so. i need interval deduction
+and i need interval join