RC Themes in the 70's

I went through the RC in the 70's to try to glean some more information and feel more comfortable going into the sections. Nothing super profound, but I was at least able to categorize them by their most common types. Feel free to add any other common structures that you find!

Straight/Regular Passages:
1) Topical Focus: Intro – Development – Reasoning
2) Defend an Opinion: Intro – Opinion – Reasoning – Refute Opposing Opinion (last two can be switched)
3) Phenomenon-Hypothesis: Intro/Phenomenon – Hypothesis – Reasoning/Refuting Opposing Hypothesis (last two can be switched)

Comparative Passages:
Passage A:
1) Stating an Opinion: Intro – Development – Conclusion
2) Defending a Thesis: Intro – Implications – Reasoning
Passage B:
1) Building off of a position in Passage A and either refuting it or developing it
2) Introducing new factors and a new position of its own