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-rw-r--r--permutations.lisp2
1 files changed, 2 insertions, 0 deletions
diff --git a/permutations.lisp b/permutations.lisp
index d75a4d2..ef843ba 100644
--- a/permutations.lisp
+++ b/permutations.lisp
@@ -1,3 +1,5 @@
+(in-package "ACL2")
+
(defun mapcar-cons (e x)
(declare (xargs :guard (true-listp x)))
(if (endp x)