My first is a number, my second another,
And each, I assure you, will rhyme with the other.
My first you will find is one-fifth of my second,
And truly my whole, a long period reckoned.
Yet my first and my second (nay, think not I cozen),
When added together, will make but two dozen.
How many am I ?
Answer will be provided next Thursday evening after 21:00.
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