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# Conflict

2000ms 65536K

## Description:

Given several formula like “variable1 relation variable2”, where relation may be <,  <=,  =,  !=,  >=,  >, variables may contain up to 10 letters or digits and are case-sensitive. Please determine whether there is a conflict.

## Input:

There are several cases. Each case begins with a line “Case%n:” (%n is the case number), and contains several formulas, one per line. There are no more than 100 formulas for each case. Please see sample input for more details. Input is terminated by EOF.

## Output:

If there is no conflict, output “YES”, otherwise, output “NO”. Please refer to sample output for the exact output format.

## Sample Input:

Case1:xyz < 123123 < 45Case2:x < yy < x

## Sample Output:

Case1: YESCase2: NO

## Note:

Info

Provider NOJ

Code NOJ1123

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Date 04/20/2019 10:03:10

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