The number of dominoes in a standard set.
The value, in millions of pounds, of the seven Picasso paintings stolen this week.
The top speed of a lone lobster in centimetres per second.
The number of people per square kilometre in the United States.
The name of the parakeet which is also known as the yellow-collared parakeet of Australia, whose cry is said to sound like '28'.
COMPETITION: There were so many correct entries to our last '26 L of the A' (letters of the alphabet) competition, we have decided to concoct a more testing set. There will be three prizes of The Larousse Dictionary of Literary Characters ('From Chaucer to Chandler, Austen to Alice Walker') for the best attempts at the following.
5 N (GFD).
2504 N of T (28 O) I.
2 G of V 5 FTTOZ 3 LM from S (the M) Send your entries to: Pastimes, The Independent, 40 City Road, London EC1Y 2DB, to arrive by the morning of 3 November.
Results and winners from last week: The longest word-chain submitted was of 11 letters: Austringers, austringer, astringer, stringer, stinger, singer, singe, sing, sin, in, I. The first three words - all in Chambers - mean 'keepers of goshawks'.
In view of our stated preference for words in common usage, we have treated this on a par with: Strapping(s), splitting(s), startling(s) and other 9-10 letter entries. Copies of Chambers Encyclopaedic Dictionary go to: Andrew Cook (Abingdon), Tony Kilburn (Winkleigh) and Iona Douglas (Oxford).