QUESTION: Fix punctuation: The nitric acid will then calm down the veins to be able to assist muscle builders to build larger sized muscular areas
ANS: The nitric acid will then calm down the veins to be able to assist muscle builders to build larger sized muscular areas.
QUES: She no longer believes in love and is sick and tired of being gay

correct the punctuation.

CORRECTED: She no longer believes in love and is sick and tired of being gay.
Question: Uninstallation As DLL files are created to support other programs and softwares working well the data and functions are actually shared by many programs when you uninstall a program custerrdll may be mistakenly deleted
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Answer: Uninstallation: As DLL files are created to support other programs and softwares working well, the data and functions are actually shared by many programs. when you uninstall a program, custerr.dll may be mistakenly deleted.
Product details Freestanding letterbox housing with 3 integrated spacesaving letterboxes with front removal

Can you repeat this sentence, but add in punctuation?
Product details Free-standing letterbox housing with 3 integrated space-saving letterboxes with front removal.
input: Previous UK Study examines smoking in cars and kids
fixed: Previous UK: Study examines smoking in cars and kids
hidclasssys blue screen slow PC program and system crashing Fix

Can you repeat this sentence, but add in punctuation?
hidclass.sys blue screen, slow PC, program and system crashing Fix