You can have milk, and you can have black tea. Though independently of each other, each of these are acceptable, when you add milk to your tea, your tea is no longer just black tea. Thus, in these 90 days you have the opportunity to abstain from milk in your tea. If you are an ambitious Englishmen you could take a sip of tea and then quickly take a sip of milk. But if the milk is in a common serving dish at the table for all to use, that might be culturally frowned upon. And if you consider the spirit of the discipline in accord with the letter of the discipline, it would be better to avoid this two-sip drinking strategy. 

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