Quote Originally Posted by adrift View Post
"DILD, WILD, VILD, DEILD, EWOLD, WBTB and SP" is incorrect
DILD, WILD, VILD, DEILD, EWOLD, WBTB, and SP is correct.

this comes from my high school English teacher. as ray said, not putting the comma in between "WBTB" and "and SP" links them together as one object, leaving the sentence unfinished.
It's not necessarily incorrect. Both are correct, but the second one avoids ambiguity (WBTB and SP being two terms or one term).

At least that is what my post-graduate teacher taught me. You could check a grammar reference if the doubt persists.