I was so touched by the overwhelming response in the Q&A session at the end of last week’s lessons. This simply motivates me to work beyond 100% to ensure all my students have a good mastery of this topic. As a result, I have come up with this set of extra practice questions which are highly intriguing but could definitely bring you to the next level of excellence. Do give a try … this exercise will benefit you. Welcome any further discussion after you have tried and checked with the solution.