s1 = '\'hello,world\''
s2 = '\'hello,\\\'adam\\\''
s3 = 'r\'hello,\"bart\"\''
s4 = 'r\'\'\'hello,\nlisa!\'\'\''
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怡红院的老鸨
s1 = '\'hello,world\''
s2 = '\'hello,\\\'adam\\\''
s3 = 'r\'hello,\"bart\"\''
s4 = 'r\'\'\'hello,\nlisa!\'\'\''