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14. Instead of ellipses insert a word which forms new words together with other words. What letter does this word contain?
  IQ test. Fast and free online iq test # 4 with answers and solutions. Question # 14. Three-letter word.
 

Explanation:
The word "PAN" contains the letter P. (PANTHER, PAN­CHROMATIC, PANTIES, PANTRY, PANDERING, PANACHE, PANCAKE).