Do not understand -helpWatch
4. describe the constructs and techniques available in three different programming languages, explain how they are implemented and documented, contrasting their implementation in your chosen three different programming languages.
5. analyse the application of logic to program design, considering principles of mathematical and propositional logic, the use of sets and iteration
Sequence is basically everything in order which means no line can be skipped.
Selection is basically IFStatement
Iteration is repetition
These are the 3 important constructs of programming
You will understand much better if you have a code or a program, you designed. Just copy and past here the code and i will explain for you so that you understand.