CPT's staged similarity comparisons establish continuity in the model system, but the inference to the target system's process still requires an extrapolative step that inherits the original circle at a higher level of abstraction.

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CPT(as a philosophical method or framework): An abbreviation for a method or theory (the full name isn't specified here, but in philosophy it often refers to a framework for comparing things). In this context, it's a system for looking at how similar things are to each other in stages.
Circularity (or 'the original circle')(in epistemology and logic): A logical problem where you need to assume something is true in order to prove it's true—like trying to prove a book is real by citing sentences from that same book.
Extrapolative step(in logical reasoning): Taking what you've learned from one situation and extending it to guess what might happen in a different, similar situation.
Model system(in research and reasoning): A simplified version of something you're studying—like a model airplane—that you use to understand how the real thing works.

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