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a rule of thumb

A rule of thumb is a general rule or principle that is based on experience rather than on scientific evidence.

As a rule of thumb, I check the oil levels in my car on the first Saturday in every month.

This means that I try to check the levels of oil in my car once a month and I try to do it on the first Saturday of each month. In practice, I might check the level of oil at different times of the month.

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