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+@startuml
+
+Title Append requested options algorithm (Kea 1.8.0)
+
+:get configured option list;
+
+:get parameter request list (PRL) from query;
+
+while (for each item from configured option list)
+ :get configured options in dhcp4 space;
+ while (for each persistent option)
+ :push back option code to PRL;
+ endwhile
+endwhile
+
+while (for each code in PRL)
+ if (option is not set in response) then (yes)
+ while (for each item from configured option list)
+ :get configured options in dhcp4 space;
+ if (found) then (first)
+ :add option to response;
+ else (not found or already found)
+ endif
+ endwhile
+ else (no)
+ endif
+endwhile
+->done;
+stop
+
+@enduml