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help required for 4 x 4 bit unsigned multiplier

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moonnightingale

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Hi In my book there is diagram of Cascaded 4x3 multiplier
what does he mean by this.
I want to design simple 4 x 4 bit multiplier. But i am confused with the pic of cascaded 4 x 4 multiplier. kindly tell me is there some change required in diagram for my requirement.
Whay he has connected those lines indicated by me.
 

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lostinxlation

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They are carries. For example, the one you pointed with "why these are used to connect" in red is a carry from P1 to P2.
 

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