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.