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one.

two times two is four, times two again is eight, times two again is sixteen; two times two times three is twelve, times two again is twenty four.

three times two is six, times three is nine; three times three times two is eighteen, three times three times three is twenty seven.

five times two is ten, times three is fifteen, times five is twenty five; five times two times two is twenty.

seven times two is fourteen, times three is twenty one.

eleven times two is twenty two.

thirteen times two is twenty six.

seventeen.

nineteen.

twenty three.