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-rw-r--r--src/algebra/strap/LIST.lsp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/algebra/strap/LIST.lsp b/src/algebra/strap/LIST.lsp
index f49808e5..d446ced6 100644
--- a/src/algebra/strap/LIST.lsp
+++ b/src/algebra/strap/LIST.lsp
@@ -145,8 +145,8 @@
(SPADCALL |l1| 1 (|getShellEntry| $ 41))
|LIST;setDifference;3$;12|)
(COND
- ((NULL (SPADCALL |l11| |l2|
- (|getShellEntry| $ 39)))
+ ((NOT (SPADCALL |l11| |l2|
+ (|getShellEntry| $ 39)))
(LETT |lu| (CONS |l11| |lu|)
|LIST;setDifference;3$;12|)))
(EXIT (LETT |l1| (CDR |l1|)