1. Lego bricks [10 points] In this question we consider the design and manufacture of Lego bricks. The photographs below show some bricks that have suffered from certain defects during the injection molding process. (A) 000 (B) (C) (D) 000 1.1. Briefly name and describe the possible cause of any manufacturing defect(s) that you can identify in each photograph (A) to (D) above (some defect types may occur in more than one photo) [4 points]. An example of a drawing showing a typical Lego assembly is below: 1 4 2 3 5 https://www.toysperiod.com/lego-set-reference/universal-building-set/basic/lego-507-1-basic-building-set/ 1.2. From a fit and tolerancing perspective, explain how Lego bricks work. What type of fit do you think exists between assembled Lego bricks? You do not need to give a specific numbered tolerance grade like "RC4"; we are looking for the general category of fit, like clearance, interference, transition, snap, shrink, or expansion. [3 points] 1.3. By considering fit and manufacturing issues, explain why the features on the underside of the bricks shown in photo B above are tubes rather than solid cylinders. [3 points]