I'm unable to post the puzzle this week, but I didn't want to leave you without a place to post comments on the puzzle. Somebody help me out by posting a copy here. Then feel free to add your *hints*.
Here's my standard reminder... don't post the answer or any outright spoilers before the deadline of Thursday at 3pm ET. If you know the answer, click the link and submit it to NPR, but don't give it away here. Thank you.
A: fir(S)t, s(E)cond, (T)hird, f(O)urth, (F)ifth, six(T)h, s(E)venth, (E)ighth, nin(T)h, tent(H) = SET OF TEETH