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Impact events are by far the most useful for defining a lunar stratigraphy as they are numerous and size in a geological instant.

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While in general seminorms need not be norms, there is an analogue of this criterion for families of seminorms, separatedness, defined below.

He defined the meaning of life as the greatest happiness principle.

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Note that the string-based structure is for defining the grammar of a language, rather than thở the formatting of the language itself.

Operationally, this period was originally defined as the time at which impact craters lost their bright ray systems.