The meaning and relevance of these terms heavily depend on the context in which they are used. Without more information, it's difficult to provide targeted advice.
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However, I can guide you on how to approach writing an essay on a topic that seems to be related to specific individuals (Carla and Sonja) and possibly objectionable content ( scat, piss, puke ). If you're looking to write about a topic that involves personal narratives, behaviors, or actions associated with specific individuals, here are some steps you might consider: