• You are noticing how a comma is used to separate items in a list.

    His room smelled of cooked grease, Lysol, and lies.

    - Mya Angelou, I Know Why the Cage Bird Sings (1969)

     

    Mr. Kelly's room smelled of laughter, learning, and success.

     

    Her cleats, shin pads, and sweats were in her backpack, slung over her shoulder, and heavy with homework.
    -Peter Abrahams, Down the Rabbit Hole (2006)