human
I'm a little confused about the different kinds of comma rules. Can you explain them for me?
assistant
The basic rule is that when using commas to separate items in a list, use a comma before each item except the last one. This means that if you have three items, you would write "a, b, c" or "a, b, c,". If you have four or more items, then you would write "a, b, c, d, e, f, g, h, i, j, k, l."