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What is missing from this sequence:

teloiv · ogidni · eulb · ? · wolley · egnaro · der

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    10
   100
 1,000
10,000

Which number comes after 10,000?

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Below is a very special grid, around each shaded number are 8 white squares.

However, each white square should have a number from 1 to 7.

Once filled in, these 8 numbers will sum to the shaded number.

In addition, once completed correctly, no row nor column will contain a duplicate number within a white square.

For example, the top row may be 5 6 4 2 3 1 7, etc.

This is a very difficult puzzle, and many people resort to using a computer to help them, which is a challenge in itself.

Puzzle Copyright © Kevin Stone

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Which letter comes next in this sequence:

Y · P · I · D · ?

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