We consider the mapping
which assigns to a four tuple ( a , b , c , d ) {\displaystyle {}(a,b,c,d)} the four tuple
Find an example of a four tuple ( a , b , c , d ) {\displaystyle {}(a,b,c,d)} with the property that all iterations Ψ n ( a , b , c , d ) {\displaystyle {}\Psi ^{n}(a,b,c,d)} for n ≤ 25 {\displaystyle {}n\leq 25}