--- /dev/null
+declare namespace fun = 'have.more.fun';
+
+declare function fun:closure($input as node()*, $result as node()*) as node()*
+{
+ let $current := $input/preceding-sibling::bidder[position()=1 and number(increase) <= 10]
+ let $new := $current except $result
+ let $all := ($result,$new)
+
+ return
+ if(exists($new))
+ then ($new, fun:closure($new,$all))
+ else ()
+};
+
+doc()//bidder[number(increase) <= 10 and (preceding-sibling::bidder[position()=1 and number(increase) > 10] or fun:closure(.,())/preceding-sibling::bidder[position()=1 and number(increase) > 10])]
\ No newline at end of file