John, Rick and Ted are boys who each have a penknife, a key and a book in their pockets. Each penknife is a different weight, being light, fairly heavy and very heavy. The other two objects can be classified in the same way with respect to their weights. Each boy has an object of a different weight, that is, one that is light, one that is fairly heavy and one that is very heavy. The key belonging to Ted is not the fairly heavy one. Rick’s book and John’s penknife are the same weight. Ted’s book, Rick’s penknife and John’s key can all be described the same way as regards their weight. Ted’s penknife is a very heavy one.

What weight is Ted’s key?