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-rw-r--r--palindrome-sandwich.lisp1
1 files changed, 1 insertions, 0 deletions
diff --git a/palindrome-sandwich.lisp b/palindrome-sandwich.lisp
index 98f5e64..b2d2a9d 100644
--- a/palindrome-sandwich.lisp
+++ b/palindrome-sandwich.lisp
@@ -7,6 +7,7 @@
;;; (true-listp y))
;;; (equal (palindromep (app y (app x (rev y))))
;;; (palindromep x))))
+(in-package "ACL2")
;; 二つのリストを連結する
(defun app (x y)