"Today, I have this problem ABC. Tomorrow, I will have the problem DCE and XYZ at the end, so students, ready up your solutions! Homework, read page 1337."
Nah, seriously, you have to read the guides. Use the search function. Clearly, you have not done it already.
The solution is simple: technical chaining.
Watch for the colors and comprehend where and why they are combined with each other.
This is the easiest way to explain it. Don't fail on it.