Professor Stanwick, the crime expert gets consulted by police and the federal government on a regular basis to get help in solving crimes. Today he finds Inspector Stevens, from the FBI, at his door asking for help with yet another case.

"What can I assist the FBI with today?, Professor Stanwick asked.
Sitting in an easy chair, Inspector Stevens replied, " The facts are these. As a result of the national effort to crack down on domestic spies, the Bureau has uncovered a ring of five spies in the local area who have started selling defense industry secrets to the Chinese consulate in New York. The five individuals have been identified, and we are intercepting their calls and messages. We believe they may be able to lead us to several similar rings in the Midwest, so we are monitoring their calls a while longer to help us identify the other rings. The problem is that they are using code names, and we need to match the individuals with the code names before we can completely understand the messages."
Professor Stanwick picked up a pad of paper and asked, "What do you have so far?"
Opening a notebook, the Inspector said, "The code names are those of well-known reindeer: Comet, Cupid, Dasher, Dancer, and Donder. We are certain that these names correspond in some order to the members of the group, all of whom live in this area.

Sal Abelardo is a civil engineer for Spacetech. His wife works for a publishing company and apparently knows nothing of his espionage activities. Peter Bircham works as a janitor for the same firm. He is single. John Cantrell is a junior executive with Aeroco. He and his wife share a condo downtown with his sister. Tim Delmarin, unmarried, is a communications expert with the same firm. The fifth member is Telly Ephesos, a retired Foreign Service Officer who spent twenty years in China. He is married and has no siblings.

From the messages already sent, and our own investigations, we've been able to glean only a few facts.

1. Cantrell and 'Dasher' and their wives sometimes take vacations together.
2. 'Cupid' is highly dissatisfied with his job.
3. Mrs. Abelardo regularly corresponds with 'Mrs. Donder'.
4. Neither 'Comet' nor 'Dasher' have ever been outside the state. '
5. Mrs. Abelardo was once engaged to the brother of 'Donder'.
6. Bircham makes monthly trips to Mexico City.

I can't impress upon you enough, Professor Stanwick, the importance of identifying these code names. Any help you can give us will be greatly appreciated."

Professor Stanwick, having been scribbling on his pad of paper, tossed it to Stevens saying, "Here are the code names and their possessors. Happy hunting!"

Which code name goes with which person?