Q 5 (PartialSome)：获取全部在其任意帐户中持有ibm股票的客户的主要电子邮件地址。

Q5 (PartialSome) : Gets the primary email address for all customers who are holding IBM stock in any of their accounts.

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注意：不要使用上面的任意三个帐户，否则将会遇到操作问题。

Note: Do not use any of the above three accounts, or you will end up with operational problems.

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可以使用任意服务帐户，只要该帐户没有管理员权限。

You can use any service account name as long as it does not have administrator rights.

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