Parallels between the Theravada Buddhist concept of hell and the Christian concept of purgatory

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Write a research proposal that also include a breakdown of chapters with a simple description for each chapter. The methodology used is textual analysis.
Hint: Theravada Buddhism which is written in Pali languages contains the terms, ap?ya (apa+aya) and niraya (ni +aya). Prefixes apa and ni means devoid of. Aya means
happiness.