The purpose of the excerpt that we have here is so that one-third maybe chosen every second year.
This is the term that is used to refer to the members of the legislative arm of the United States. These are the people that are tasked with the making of laws in the country.
This excerpt in summary is telling us of the necessary ways and the processes of election of the senators in to the United States congress.
It tells us that they would be divided from 6 into three equal halves. This would then be followed by choosing them every two years.
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