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Here's a batch of letter sequence puzzles for you. The goal is simple: Figure out which letters go in the blanks. Try it out for yourself and see what you can get.

Puzzle #1 K, H, D, M, D, _, _ (Solved By Bailey M)

Puzzle #2: A, B, E, F, G, H, I, J, N, P, _

Puzzle #3: I, E, H, O, I, I, E, I, I, E, _, _ (Solved By Joe Z.)

Puzzle #4: O, U, E, H, R, _, _ (Solved By Joe Z.)

The puzzles are in order from easiest to hardest.

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  • $\begingroup$ This seems like it can be easily compared to a number-sequence puzzle, in which answers could be much too broad to be given only 3-5 letters initially. $\endgroup$ – Mark N May 28 '15 at 20:39
  • $\begingroup$ Hmm... good point! I'll be sure to add some more. $\endgroup$ – Xandawesome May 28 '15 at 20:40
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    $\begingroup$ I have to admit, number 2 has been harder than all the rest so far. $\endgroup$ – Joe Z. May 29 '15 at 2:08
  • $\begingroup$ C, D, K, L, M, O - just figured it might help people to see, maybe? Still trying to see what might be common in either the present or absent letters... $\endgroup$ – Glen O May 29 '15 at 14:46
  • $\begingroup$ Wow! The second one must be pretty difficult! $\endgroup$ – Xandawesome May 31 '15 at 3:00
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Sequence 3:

The second letters of each ordinal number: first, second, third, fourth, fifth, ...

The letters afterward are L and W.

Sequence 4:

The second letters of each day of the week. This one's appeared on the site before.

The letters afterward are A and U.

More to come later.

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  • $\begingroup$ Nice! Good job! $\endgroup$ – Xandawesome May 29 '15 at 1:14
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Well, let's start off with the first sequence...

The next two letters are

C, M.

The sequence is

Metric measurements! Kilometer, Hectometer, Decameter, Meter, Decimeter, Centimeter, Millimeter.

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  • $\begingroup$ Good job! That was it! $\endgroup$ – Xandawesome May 28 '15 at 22:11
  • $\begingroup$ Keep on going, I have a feeling that you might get a lot of them! $\endgroup$ – Xandawesome May 28 '15 at 22:33

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