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+; P17 Split a list into two parts; the length of the first part is given.
+; Do not use any predefined functions.
+
+(def a (list "a" "b" "c" "d" "e" "f" "g" "h" "i" "k"))
+
+(func spl (lst idx)
+    (spl lst idx (list)))
+
+(func spl (lst idx acc)
+    (if (eq? idx 0)
+        (list acc lst)
+        (spl (rest lst) (-- idx) (append acc (first lst)))))
+
+(func -- (num) (- num 1))
+
+(print (->string a))
+(print (->string (spl a 3)))