The following synthesis was developed as a method to prepare 4-aryl piperidine derivatives, a group of compounds containing a common structural unit found in a variety of active pharmaceutical agents. Draw the structures of compounds A and B.

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.