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Natural numbers are also used as labels, like jersey numbers on a sports team, where they serve as nominal numbers and do not have mathematical properties. [5] The natural numbers form a set, commonly symbolized as a bold N or blackboard bold . Many other number sets are built from the natural numbers.
The Puerto Rico Department of Natural and Environmental Resources (DRNA) was created by Law Number 23 of June 20, 1972. The first head of the Department was Cruz Matos. [5] In 2016 the agency's headquarters where temporarily moved from the Cruz A. Matos building in Cupey due to problems with the ventilation. [6]