To avoid confusion, use commas to separate words and word groups with a series of three or more.
Example:
My $10million estate is to be split among my husband, daughter, son, and nephew. Omitting the comma after son would indicate that the son and nephew would have to split one-third of the estate.
The Confessions of Second Hand Rose
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“Age changes you. The first half of my life, I wanted to be interesting to
many people. Now as I am on the second half, I only want to be interested
and in...