find the labeled nodes voltage..shown in figure.

4.44 For each of the circuits shown in Fig. P4.44, find the labeled node voltages. The NMOS transistors have V, = 1 v and k, W/L=2 mA/V?. Assume A=0. + 10 V + 10 V +5 V 1 kN ov, V V4 OV2 Vs 1 kN 1 kN -5 V (a) (b)