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...NO - - 3 2 1 | 4 5 6 | 7 8 9 | 10 11 12 NO - - - 1 2 4 | 3 5 6 | 7 8 9 | 10 11 12 YES-----2nd permutation - - 4 5 6 | 1 2 3 | 7 8 9 | 10 11 12 YES-----3rd permutation - - - - - - 4 5 6 | 2 1 3 | 7 8 9 | 10 11 12 NO - - .... Thanks for your time, Jordi Altirriba Ph D student Hospital Clinic - Barcelona - Spain MSN Motor. http://motor.msn.es/researchcentre/

...utations is because I'm using some packages of Bioconductor to analyse my data from some microarrays and I thought that perhaps could be interesting to see what happens when I permute my data and I compare it against the not permuted data. Thanks again for your time and suggestions. Jordi Altirriba Ph. D. Student Hospital Clinic-Barcelona-Spain

...ation in our problem but not for the Kirkman problem: 1 2 3 | 4 5 6 | 7 8 9 | 10 11 12 1 2 4 | 3 5 6 | 7 8 9 | 10 11 12 For Kirkman?s problem, the four blocks should be different in the two permutations. Thanks to all, and sorry for the initial confusion with intra-block permutations, Jordi Altirriba PhD student Hospital Clinic - Barcelona - Spain