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The Clue
Dimensions: Abbr. (4 letter answer)
The Answer
MSTS
Tags
Notes
The answer MSTS is so rare that it appears less than once every 2500 puzzles.
Definition
MST as a noun:
1. (Mountain Time, Mountain Standard Time, MST) = standard time in the 7th time zone west of Greenwich, reckoned at the 105th meridian west; used in the mountain states of the United States