605?

今天偶然買到了605的實物玩具(雖然都頗粗製濫造...)
不知會否幫助解題?~

今天下午在公司聽了4小時的training,累得要死........

收到Johnson send來的故事:
An actual event in Dantzig's life became the origin of a famous urban
legend in 1939 while he was a graduate student at UC Berkeley. Near the
beginning of a class that Dantzig was late for, professor Jerzy Neyman
wrote two examples of famously unsolved statistics problems on the
blackboard. When Dantzig later arrived he assumed that the two problems
were a homework assignment and wrote them down. According to Dantzig,
the problems "seemed to be a little harder than usual", but a few days
later he handed in completed solutions for both, still believing that
they were an assignment that was past due. Six weeks later Dantzig
received a visit from an excited professor Neyman, who had prepared one
of Dantzig's solutions for publication in a mathematical journal. Years
later another researcher, Abraham Wald, was preparing to publish a paper
which arrived at a conclusion for the second problem, and included
Dantzig as its co-author when he learned of the earlier solution.