## Task B-3.2.

If $\log _{2}\left[\log _{3}\left(\log _{4} x\right)\right]=\log _{3}\left[\log _{2}\left(\log _{4} y\right)\right]=\log _{4}\left[\log _{3}\left(\log _{2} z\right)\right]=0$, calculate $\log _{y}\left(\log _{z} x\right)$.