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Crossword solution:
S
I
R
S
17 clues for "SIRS":
"Dear ___ ..."
Letter "opener."
Knights' titles.
Dear ones
Epistolary salutation
Gentlemen.
Knights.
Salutation.
Titled ones.
Titles.
Baronets.
Baronets' titles.
Business letter greeting
"Dear" group
Letter lead-off.
Letter openers
Letter salutation.