In theory, international civil servants at the United Nations are prohibited from continuing to draw salaries from their own governments; in practice, however, some governments merely substitute living allowances for their employees' paychecks, assigned by them to the United Nations.
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Afor their employees' paychecks, assigned by them
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Bfor the paychecks of their employees who have been assigned
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Cfor the paychecks of their employees, having been assigned
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Din place of their employees' paychecks, for those of them assigned
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Ein place of the paychecks of their employees to have been assigned by them
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