
MD5 = a33ca7a68b2dbae8b9e533004b647829
Thank you for all the creative answers!
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To make stage 4 of the PSI test more transparent for the participants, the MD5 checksum for the January 2009 solution image is already available: MD5 = 7d6606aab665f126aaca283fef7bdda4 When the solution image is finally displayed here January 2009, you can use this md5 program (Windows) or a similar program for your system, to generate the md5 checksum of the image and compare it to the line above. Usage at the prompt: md5sums epsi.gif |