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The Su Doku bug

Sir, Two Su Dokus (letter, June 22) saved my life. Had I not had them to do under the table in a non-air-conditioned, six-hour meeting, where the names and grades of thousands of students were read out, and where the highlight was a heated debate on whether a student granted an extension because of illness should be recorded as NS (non-submission) or E (retrievable fail), I should have lost my reason.

Next year the meeting is on June 20. Please print four.

KEITH KIRBY

Monmouth, Monmouthshire

From Mr Des Millward

Sir, Unlike your correspondent Mr Mike Bennett I am not at all worried about the effect of Su Doku on my work. I would deem it a great pleasure to have the Saturday Samurai five-square puzzle each day to relieve the boredom.

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DES MILLWARD

Ashby St Mary, Norwich