The clue "Principal line" last appeared in the USA Today crossword on April 3, 2019. The correct answer for this puzzle is "MAIN", a 4-letter word.
Solution MAIN is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is MAIN with 4 letters, and the shortest is MAIN with 4 letters.
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The solution is 4 letters long.