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.
For example, ANGLEM can have ENT added at the start and the end to become ENT + ANGLEM + ENT = ENTANGLEMENT.
[Ref: ZTVA] © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (203.08) and is used with permission.
ENT + ERTAINM + ENT = ENTERTAINMENT
RED + ISCOVE + RED = REDISCOVERED
ING + ROW + ING = INGROWING
ANT + IOXID + ANT = ANTIOXIDANT
MIC + ROCOS + MIC = MICROCOSMIC
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