fix issue

app.py

@@ -28,7 +28,7 @@ def main():
 				   ("t5-base-wikisplit","t5-v1_1-base-wikisplit", "byt5-base-wikisplit","t5-large-wikisplit"))
 
 	change_example = st.sidebar.button("Try Different Example")
-	
+
 	st.sidebar.write('''
 		## Applications:
 		* Sentence Simplification
@@ -48,8 +48,10 @@ def main():
 		"The East London Line closed on 22 December 2007 and reopened on 27 April 2010 , becoming part of the new London Overground system ."
 	]
 	example = examples[random.randint(0, len(examples)-1)]
-	if change_example:
+	previous_example = example
+	while change_example and example==previous_example:
 		example = examples[random.randint(0, len(examples)-1)]
+	previous_example = example
 	input_complex_sentence = st.text_area("Please type a Complex Sentence to split",example)
 
 	if st.button('Split✂️'):