help $1.$ A power system network in shown in Figure $1.$ The generators at buses $1$ and $2$ are represented by their equivalent current sources with their reactance in per unit on a $100$MVA base. The lines are represented by $\backslash (\backslash$pi $\backslash )$ model where series reactances and shunt reactances are also expressed in per unit on a $100$ MVA base. The loads at buses $3$ and $4$ are expressed in MW and MVar. Assuming a voltage magnitude of $1\mathrm{.}0$ per unit at buses $3$ and $4,$ convert the loads to per unit impedances. Convert network impedances to admittances and obtain the bus admittance matrix by inspection.