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Note: 

The emails are given for an idea about domains and types of emails. The initial ID of email has been removed with (EMAIL) letters in these sample addresses 

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abc@a-sung.co.kr
abc@mbc.co.kr
abc@kepco.co.kr
abc@joongang.co.kr
abc@hanmail.net
abc@kma.go.kr
abc@exponet.co.kr
abc@unitel.co.kr
abc@nipsea.co.kr
abc@shinbiro.co.kr
abc@gmail.com
abc@stmail.chosun.ac.kr
abc@kongju.ac.kr
abc@sji.co.kr
abc@mk.co.kr
abc@rist.re.kr
abc@alphatrans.co.kr