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1
When the letter is informal
use
a
comma
.
2
Don't worry, though, you can continue to
use
a
comma
to delimit the primary and secondary keys.
3
If the clause is not essential to the meaning of the sentence,
use
a
comma
and the word which to attach it.
4
Unconventional punctuation-forexample
using
a
comma
to splice two sentences-hasalso been retained exactly as printed.
5
A French printer named Morel
used
a
comma
in the outer margin to indicate a quoted line about 1550.
use
a
comma
use