The clue "Rock salt is one" last appeared in the Universal crossword on January 12, 2017. The correct answer for this puzzle is "ORE", a 3-letter word.
Solution ORE is 3 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is ORE with 3 letters, and the shortest is ORE with 3 letters.
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The solution is 3 letters long.