The circuit is a Full Adder constructed from two Half Adders and an auxiliary two-input OR gate.
Variables / Signal Names:
CI = Carry Input
AG = Augend
AD = Addend
SUMf = (Full adder) Sum
COf = (Full adder) Carry Output
For Half Adder:
https://www.multisim.com/content/YZgqMmn73ceEynBkiRXUeS/half-adder/
For Configurable-Mode Full Subtractor/Adder Using Half Subtractor/Adder And Half Adder:
https://www.multisim.com/content/7f3C4LtEzu8adz9gefm5yf/configurable-mode-full-subtractoradder-using-half-subtractoradder-and-half-adder/
For Simultaneous Dual Function Half Adder-Subtractor:
https://www.multisim.com/content/MoUhGPsqRXjNsmYbzrMahn/simultaneous-dual-function-half-adder-subtractor/
For Ripple Adder:
https://www.multisim.com/content/ucmGmBfuXe7JnCz592SHQ7/ripple-adder/
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