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All answers having "Massachusetts city" as clue:

4 Character Answers:

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LYNN



5 Character Answers:

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ATHOL

SALEM



6 Character Answers:

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AGAWAM

BOSTON

LOWELL

MALDEN

WESTON



7 Character Answers:

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EVERETT

NEEDHAM



9 Character Answers:

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ATTLEBORO

FALLRIVER

HAVERHILL