Typical mistakes for Z-Ro:
x-ro,  s-ro,  a-ro,  z0ro,  zpro,  z-eo,  z-do,  z-fo,  z-to,  z-5o,  z-4o,  z-ri,  z-rk,  z-rl,  z-rp,  z-r0,  z-r9,  -ro,  zro,  z-o,  z-r,  -zro,  zr-o,  z-or,  zz-ro,  z--ro,  z-rro,  z-roo