diff --git a/random_expression.py b/random_expression.py
index edac8b0..2a81215 100644
--- a/random_expression.py
+++ b/random_expression.py
@@ -121,7 +121,7 @@ def desc_rdExp(rdExp):
 
 
 if __name__ == '__main__':
-    form = "{a}*-14 / 2*{b} + -23"
+    form = "{a}*-14 / (2*{b}) : -23 / 4"
     cond = ["{a} + {b} in [1, 2, 3, 4, 5]", "{a} not in [0,1]", "{b} not in [0,1]"]
     rdExp1 = RdExpression(form, cond)
     desc_rdExp(rdExp1)