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-rw-r--r--ex/2/51.rkt9
1 files changed, 9 insertions, 0 deletions
diff --git a/ex/2/51.rkt b/ex/2/51.rkt
index 975c064..8f28d76 100644
--- a/ex/2/51.rkt
+++ b/ex/2/51.rkt
@@ -43,3 +43,12 @@
(lambda (frame)
(paint-above frame)
(paint-below frame)))))
+
+
+;;; below in terms of rotate operations
+(define (below-rot painter1 painter2)
+ (let ((painter1-270 (counterclockwise-270 painter1))
+ (painter2-270 (counterclockwise-270 painter2)))
+ (counterclockwise-270
+ (counterclockwise-180
+ (beside painter1-270 painter2-270)))))