QuoteOriginally posted by: alexandreCThe concept is that there are four states A, B C and D, with the following transition rules:A<-->B<-->C<-->D <-->A(for example, A= 11 B=10 C=00 and D=01 where 1 stands for ON and 0 for off.)There shall be 4 comandments: 1. Only the master is allowed to make the A-->B transition. He counts these transitions. 2. All the others shall make one, and only one C-> D transition. they shall make it at the first oportunity. 3. With exception to one of them, that shall make two C-->D transitions. (to ensure that the initial condition is not relevant.) 4. All the other movements shall be oscillations between A <--> D or B <---> C.(note that the rules imply that the transitions B-->A and D--> C are allways forbiden)- also, that the master never performs a C->D transition. (he could, just for fun, but it would take longer for them to get freed! )When our master counts until 21, game over, let's get out of the prision! A.test this one:start position C2.2.1.2.2.2.1.3.3.3.1...19.19.19.1The leader will never reach 21