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THIS week I have replaced every letter of the alphabet by a digit. Of course, that means that some digits may represent several different letters, but any particular letter is replaced by the same digit throughout.

With my particular use of the digits you will find that each of the following seven:

TWO THREE FOUR FIVE

SIX SEVEN EIGHT

is a number and that although one of the three-figure numbers is not a square all the remaining six numbers are perfect squares.

Please send in your ROOTS.

A £10 book token will be awarded to the sender of the firt correct answer opened on Thursday 7 September. The Editor’s decision is final. Please send entires to Enigma 834, New Å®ÉúСÊÓƵ, King’s Reach Tower, Stamford Street, London SE99 0BB. The winner of Enigma 828 was Colin Singleton of Sheffield.

Answer to Enigma 828

A line of boxes

Yes, No, No, Yes, Yes, Yes