diff --git a/kjs254/README.md b/kjs254/README.md
index 09d98ff..a83e873 100644
--- a/kjs254/README.md
+++ b/kjs254/README.md
@@ -11,4 +11,5 @@
 | 7차시 | 2024.03.01 | 구현 | [캐시](https://school.programmers.co.kr/learn/courses/30/lessons/17680) | [#24](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/24) |
 | 8차시 | 2024.03.08 | 구현 | [튜플](https://school.programmers.co.kr/learn/courses/30/lessons/64065) | [#30](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/30) |
 | 9차시 | 2024.03.10 | 구현 | [뉴스 클러스터링](https://school.programmers.co.kr/learn/courses/30/lessons/17677) | [#33](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/33) |
+| 10차시 | 2024.04.02 | 해시 | [전화번호 목록](https://school.programmers.co.kr/learn/courses/30/lessons/42577) | [#46](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/46) |
 ---
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diff --git "a/kjs254/\355\225\264\354\213\234/\354\240\204\355\231\224\353\262\210\355\230\270 \353\252\251\353\241\235.py" "b/kjs254/\355\225\264\354\213\234/\354\240\204\355\231\224\353\262\210\355\230\270 \353\252\251\353\241\235.py"
new file mode 100644
index 0000000..9e6e9bf
--- /dev/null
+++ "b/kjs254/\355\225\264\354\213\234/\354\240\204\355\231\224\353\262\210\355\230\270 \353\252\251\353\241\235.py"	
@@ -0,0 +1,6 @@
+def solution(phone_book):
+    phone_book.sort()
+    for i in range(len(phone_book)-1):
+        if phone_book[i+1].startswith(phone_book[i]): 
+            return False
+    return True
\ No newline at end of file