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我需要检查一个字符串是否包含一组字符，并且它们需要出现正确的次数。
string1 = "somestring"
string2 = "thestrings"
characters = "egimnorsst" # Note that there are two 's' characters here
does_string_contain(string1, characters) # True
does_string_contain(string2, characters) # False
