Contest: Task: Related: TaskA TaskC

Score : $200$ points

There are $N$ people. The family name and given name of the $i$-th person $(1 \leq i \leq N)$ are $S_i$ and $T_i$, respectively.

Determine whether there is a pair of people with the same family and given names. In other words, determine whether there is a pair of integers $(i,j)$ such that $1 \leq i \lt j \leq N$, $S_i=S_j$, and $T_i=T_j$.

- $2 \leq N \leq 1000$
- $N$ is an integer.
- Each of $S_i$ and $T_i$ is a string of length between $1$ and $10$ (inclusive) consisting of English lowercase letters.

Input is given from Standard Input in the following format:

$N$ $S_1$ $T_1$ $S_2$ $T_2$ $\hspace{0.6cm}\vdots$ $S_N$ $T_N$

If there is a pair of people with the same family and given names, print `Yes`

; otherwise, print `No`

.

3 tanaka taro sato hanako tanaka taro

Yes

The first and third persons have the same family and given names.

3 saito ichiro saito jiro saito saburo

No

No two persons have the same family and given names.

4 sypdgidop bkseq bajsqz hh ozjekw mcybmtt qfeysvw dbo

No