$($b$)[10$ points$]$ You've been thinking about your design and how it was nearly ruined by some jealous jerk. Now you're really going to turn up the heat on the other students. You decide to make your design even better by using full address decoding. You ask Nagui for a $3-$line to $8-$line decoder and he has one in his pocket! So he gives it to you and also writes out the function table from memory. You confess to him that you've never used such a part before. He looks you in the eyes, stares into your soul, and says it's just quicker for him to do it for you. Humiliated, you watch him rapidly wire up the breadboard. "There that should do it$,"$ he announced and then disappeared. You look over his work and realize he never told you the memory mapping. Oh boy, you don't dare disturb him again. Instead you figure out all the connections for the $3-$line to $8-$line decoder and using the truth table he gave you, you attempt to figure out the memory ranges that when placed on the address bus will activate each RAM chip. You think maybe Nagui made a mistake. Did he$?$ You're too scared to ask him.

FUNCTION TABLE

Figure $2$: Nagui's memory interface circuit.