diff --git a/app.py b/app.py
index 92832af..905b933 100644
--- a/app.py
+++ b/app.py
@@ -21,6 +21,37 @@ def select_numbers(select_amount:int):
 
     lotto = [1,2,3,4,5,6]
 
+    ## example 1
+    lotto = []
+    for i in range(select_amount):
+
+        while True:
+            select_num = random.randint(1, 45)
+
+            is_duplicated = False
+            for num in lotto:
+                if select_num == num:
+                    is_duplicated = True
+                    break
+
+            if is_duplicated:
+                continue
+            lotto.append(select_num)
+            break
+
+    ## example 2
+    '''
+    candidate_numbers = lotto_numbers[:]
+    lotto = []
+    for i in range(select_amount):
+        select_num = candidate_numbers.pop(random.randrange(len(candidate_numbers)))
+        lotto.append(select_num)
+    '''
+
+    ## example 3
+    '''
+    lotto = random.sample(lotto_numbers, select_amount)
+    '''
 
     return lotto