Problem $2$: $4-$step process, OD Demand Table: $(10$ point$)$

Please briefly discuss the major output $($namely $T_o,T_d,T_{0,d},T_{0,d,m},$ and $T_{0,d,m,r})$ of each step in the $4-$step transportation planning process. Please fill out the following origin$-$destination table for $4$ zones.

Fig. $2.$ A transportation network with $4$ zones