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Published online by Cambridge University Press: 24 October 2008
(i) In the penultimate line of § 1, the reference should be to example (iii)
(ii) The right-hand side of equation (31) should be divided by 3.
(iii) Two lines below equation (33), v should be defined as the highest common factor of n, u1, u2,…
(iv) Similarly in the penultimate line of the paper (before the References) the words ‘and of n’ should be added.