Subtraction of the 2's-complement system actually involves the operation of ________.

The 74HC382 ALU can perform ________ operations.

The binary adder circuit is designed to add ________ binary number(s) at a time.

When decimal numbers with several digits are to be added together using BCD adders ________.

In VHDL, the architecture declaration always begins with the ________ of variable signals or components that will be used in the concurrent description between BEGIN and END.