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https://projectresearch.co.kr/2010/12/19/iphone%ea%b3%bc-cloud-sync%eb%a5%bc-%ec%a7%80%ec%9b%90%ed%95%98%eb%8a%94-%eb%ac%b4%eb%a3%8c-gtd-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-wunderlist-things%eb%a5%bc-%eb%b2%84%eb%a6%ac%ec%84%b8%ec%9a%94/
iPhone과 Cloud Sync를 지원하는 무료 GTD 프로그램 - Wunderlist (Things를 버리세요)