세션 ID : tv1nvhrhdmim11kn3fm1njqhkp
session1 :
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session2 :
Warning: Undefined array key "session2" in /users/2019/i1919021/public_html/2022/WebProg/ch10/exam10-05.php on line 12
session3 :
Warning: Undefined array key "session3" in /users/2019/i1919021/public_html/2022/WebProg/ch10/exam10-05.php on line 13
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