A question in building a circuit using 2 full adders

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transgalactic
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which produces a sum of 2 bit numbers x0x1 y0y1
the output is C (carry)
S0S1

the problem is i know how to build a truth table and a KARNO table
and even how to build this circuit

i know how to build a full adder circuit

the problem is i don't know how to build this task using 2 full adders
 
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Chain the outputs with the clock cycle.


In English, the clock is an input, for adder A, and itz carry is the input for adder B which holds the final solution.
 
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