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6. to separate elements in a series:
I went to the store and bought milk, bread, and eggs.
7. to separate coordinate modifiers:
The clear, smooth finish of the desktop is attractive.
8. to set off non-restrictive clauses:
My faculty advisor, who had to sign my program card, is hard to find.
9. to set off non-restrictive participial phrases:
Uncle Sid's letter, lying in the dead-letter office, contained the missing document.
10. to set off non-restrictive appositive phrases:
Reaching absolute zero, 273.15 degrees below zero Celsius, is one goal of scientists.