Problem: Write a program to continuously read three $4-$bit numbers and write a $3-$bit result. If any input number is larger than $8,$ then the output is $0.$ Otherwise the output is the maximum input number. Only use ports B and D$.$

Problem: Write a program to generate the following signal on RB$1.$

Where $t$ is a $4-$bit number entered by the user using pins RB$2($least significant$)$ to

RB$5($most significant$).$