Define a $4-$bit Carry Look$-$ahead Adder $($CLA$)$ using structural Verilog $($i$.$e$.,$ define a module for the bit$-$slice component and a module for the Carry Propagate Generate Network $($CPGN$),$ and then connect four bit$-$slice modules to the CPGN$).$

Simulate your circuit to verify its function, and then program it into the Boolean Board. Use the $8$ slide switches to define the inputs, and display the output on two digits of the seven$-$segment display.