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Verification of the social security number in Poland
It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.
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Weighted average ratings
The calculator calculates the weighted average of the ratings of the following items.
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The calculator calculates the amount of collected rainwater from the roof of the given dimensions.
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Calculator based on the specified time from seeing lightning until you hear thunder in the distance calculated discharge occurred.