My thanks to everyone for their responses. What happened is this:
I published a Hub on November 24, 2011 that discussed Saying Merry Christmas in 110 Languages. HubPages certified the Hub as being original. The Hub score for my article is in the mid-90s.
On November 30, 2011, someone published a Hub that discussed 101 Ways of Saying Merry Christmas in Different Languages. Although my Hub contains introductory paragraphs of text, both articles primarily are lists of languages and the way that "Merry Christmas" is said in each language.
I flagged the other person's Hub as possibly being duplicate content. I also sent an e-mail to HubPages yesterday evening.
When I look at my Hub online, the other Hub is listed in the column on the right as being a related Hub. The score for my Hub dropped five points from what it was late last night. I hope it doesn't drop any more.