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Each of the following sets of letters can be made into a real word by adding three letters to the beginning, and the same three letters in the same order to the end.
ertainm iscove row ioxid rocos
For example:

   iperspir
   ??? + iperspir + ???
   ant + iperspir + ant
   antiperspirant

Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (203.08) and is used with permission.

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What letter comes next in this sequence:

X  L  C  D  ?

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What letter is missing from this sequence:

A  A  A  A  ?  A  A  A  A  A  A
Clue: the answer is not A!

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What common animal comes next in this sequence:

eel  cat  lion  ibex  panda  squirrel  ?

Puzzle Copyright © Kevin Stone

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