How to draw this piece of work(attached file) in Catia?

This is the second work given to me by our professor. However am really thankful for the second question I put last time has been answered well by one of this community member providing a very helpful and clear steps to to the sketch. This is the second homework and I find it very difficult and unlike the first one, it is more confusing especially for beginners like me. Please help me here anyone.

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