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+; P10 Run-length encoding of a list.
+; Use the result of problem P09 to implement the so-called run-length
+; encoding data compression method. Consecutive duplicates of elements
+; are encoded as arrays [N, E] where N is the number of duplicates of the
+; element E.
+
+(use "p09.neb")  ; NOTE: this runs everything at this juncture, not just def/func
+
+(func encode (lst)
+    (map
+        (lambda (item)
+            (list (length item) (first item)))
+        lst))
+
+(print (->string (encode (pack-dup a))))