If you have one wire you can address two memory cells number 0 (power off) and number 1 (power on).
With two wires you can address 4 memory cells. With four wires you can do 16. If you want 17 memory cells you need to have everywhere 5 wires and use the fifth one for just that one cell. This is not efficient. If you already have the wire in place, why not to utilize all the possible capacity of it?
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