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Task/Order-disjoint-list-items/EchoLisp/order-disjoint-list-items.echolisp

@@ -0,0 +1,30 @@
+(lib 'list) ;; for list-delete
+
+(define dataM
+'((the cat sat on the mat)
+(the cat sat on the mat)
+(A B C A B C A B C)
+(A B C A B D A B E)
+(A B)
+(A B)
+(A B B A)))
+		
+(define orderM
+'((mat cat)
+(cat mat)
+(C A C A)
+(E A D A)
+(B)
+(B A)
+(B A)))
+
+(define (order-disjoint M N)
+(define R (append N null)) ;; tmp copy of N : delete w when used
+	(for/list [(w M)]
+	(if
+		(not (member w R)) w ;; output as is
+		(begin0
+		(first N) ;; replacer
+		(set! N (rest N))
+		(set! R (list-delete R w))))))
+