can some one explain to me this prom circuit..

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i need to implement a circuit that has 8 bit input number
and its output is the complement two of this number.
i need to implement it using
2^5 X 4 2^4X4 proms
here is the solution:
**broken link removed**

but i cant understand how they constructrud the thables??

why there is a data line goes into the address line of another prom???
 
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