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Is the phrase is a palindrome
Calculator checks to see if the specified expression is a palindrome. Palindrome - sounding words as read from left to right and from right to left.
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Calculator allows you to verify the ISBN number entered.
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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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Verifier numbers EAN-13
Calculator allows you to verify the number entered EAN-13.
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The calculator calculates the circumference of an ellipse for a given length of the axis passing through it.