- Use a pair of commas or a comma and a period to enclose certain
elements. When enclosing, do not put down one mark and forget
the other.
- Use a pair of commas or a comma and a period to enclose these:
- Titles such as "M.D.,'' "PhD,'' or Jr.''
Names of states
Years in dates
Words of direct address
Inserted sentence elements
Parenthetical elements
Appositives
Nonidentifying (nonrestrictive) elements
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