SIX LETTERS IT CONTAINS TAKE AWAY THE LAST AND ONLY TWELVE REMAINS R RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Noel (more literally no l). Did you answer this riddle correctly?
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There are 11 letters in "THE ALPHABET." Did you answer this riddle correctly?
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Dozens Did you answer this riddle correctly?
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If it was, then it will be a foot. Did you answer this riddle correctly?
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A door Did you answer this riddle correctly?
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Alone.

Behead me and I am Lone.
Behead me again and I am One. Did you answer this riddle correctly?
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Post Office Did you answer this riddle correctly?
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The correct answer is T-H-A-T. Did you answer this riddle correctly?
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The answer is that one girl took the picnic basket. She took the last bottle of wine while it was in the basket. Did you answer this riddle correctly?
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The answer is that one girl took the basket. She took the last apple while it was in the basket. Did you answer this riddle correctly?
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Sleep. Its the time your mind organizes memories and knowledge. Sleep deprivation is miserable (as you well know if youve experienced it). If you miss a few nights of sleep, you can sleep more to catch up with no problems. And some believe that segmented sleep, where you sleep, wake for an hour, then go back to sleep, was the dominant form of sleep before the Industrial Revolution. Did you answer this riddle correctly?
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String. A string ties objects together. You wear a ring, a sting hurts, according to the Bible, Adam & Eve committed a sin and you sing with your mouth. Did you answer this riddle correctly?
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They read the same right side up and upside down. Did you answer this riddle correctly?
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The letter C. (Sea) Did you answer this riddle correctly?
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They are the only three US state abbreviations whose two letters are next to each other in the alphabet.

DE Delaware
HI Hawaii
MN Minnesota Did you answer this riddle correctly?
YES  NO