Consider an ionic solid $\mathbf{M X}$ with NaCl structure. Construct a new structure $(\mathbf{Z})$ whose unit cell constructed from the unit cell of $\mathbf{M X}$ following the sequential instructions given below. Neglect the char balance. (i) Remove all the anions ( $\mathbf{X}$ ) except the central one
(ii) Replace all the face centered cations (M) by anions (X)
(iii) Remove all the corner cations (M)
(iv) Replace the central anion (X) with cation (M)
The value of $\left(\frac{\text { number of anions }}{\text { number of cations }}\right)$ in $\mathbf{Z}$ is $\_\_\_\_$ .