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diff --git a/p99/p16.neb b/p99/p16.neb
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+; P16 Drop every N'th element from a list.
+
+(def a (list "a" "b" "c" "d" "e" "f" "g" "h" "i" "k"))
+
+(func drop-n (lst n)
+    (drop-n lst n (list) n))
+
+(func drop-n (lst :nil n acc idx)
+    acc)
+
+(func drop-n (lst :{:any} n acc idx)
+    (if (eq? 1 idx)
+        (drop-n (rest lst) n acc n)  ; reset n, don't add to acc
+        (drop-n (rest lst) n (append acc (first lst)) (-- idx))))
+
+(func -- (num) (- num 1))
+
+(print (->string a))
+(print (->string (drop-n a 3)))