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Here is my code
(defun create_tree (M N D)
(if (> N M)
nil
(loop for i from 1 to D for j from 1 to D
if (< (+ i j) (+ D 1))
(create_subtree M N i j)
)
))
Sorry for the trouble. However, I found a way around it using dotimes inside of loop.

Hello, I am writing a code to create a tree in lisp but I am facing the following problem Here is my code (defun create_tree (M N D) (if (> N M) nil (loop for i from 1 to D for j from 1 to D if (< (+ i j) (+ D 1)) (create_tree M N i j) ) )) This gives a syntax error, however when I comment the "...