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On occasion I omit commas. On occasion, I use them. (The more you know about English, the less you're likely to think there are unbreakable "rules" for a lot of these things.)

"Grammar Geekery With Bill Walsh". Live chat, live.washingtonpost.com. January 5, 2016.
On occasion I omit commas. On occasion, I use them. (The more you know about English, the less you're likely to think there are unbreakable rules for a lot of these things.)