This is a calculator that contains a pair of skew lines. The skew lines are at the top of the calculator and at the bottom. The two lines will never instersect and are not parallel to each other.Calculators are used to solve math problems (and sometimes a secret messages or two). Calculators are used my engineers, architects, accountants and etc. You can find calculators in the store or in most schools. this picture was found online:http://www.confluencedigital.com/resources/customer-lifetime-value-calculator/
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