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12. Letter series

Which letter is missing?

Notice the intervals between the letters when they are in alphabetical order.

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What is two times two?

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phyciquesays...

Look out for successive intervals of 3 letters!

Starting out from the left or right doesn't matter.

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Ice-Tsays...

Beginning from right to left, in alphabetical order, interval of 3 letters between each successive letter.

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