In General, the reason this upnai often used in research in the sciences, such as the conclusion that Neem extract can be used as a medicine to get rid of the pest, such conclusions came from an experiment is repeated. Together several times, and then the corresponding result in mathematical reasoning, the upnai will be used. In creating such axioms when we try to drag a straight line, two lines, we find that cutting a straight line, two lines would be cut only at some point. No matter how many times they tried to drag, we assume that two straight lines contrasting "just the spot.
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