What are the great forty according to MN117?

Discussion
1

What are great forty? What are the great forty according to following Sutta.?

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“Therein, bhikkhus, right view comes first. And how does right view come first? In one of right view, right intention comes into being; in one of right intention, right speech comes into being; in one of right speech, right action comes into being; in one of right action, right livelihood comes into being; in one of right livelihood, right effort comes into being; in one of right effort, right mindfulness comes into being; in one of right mindfulness, right concentration comes into being; in one of right concentration, right knowledge comes into being; in one of right knowledge, right deliverance comes into being. Thus, bhikkhus, the path of the disciple in higher training possesses eight factors, the arahant possesses ten factors.

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It’s based on the ten-fold path for the arahant, where right knowledge and right deliverance are added to the usual eight path factors. For each path factor there is right and wrong, and also associated wholesome and unwholesome states. Right abolishes wrong, and wholesome states displace unwholesome states. It would be interesting to know exactly what right knowledge and deliverance are here - do they refer to nibbana?

3

Right knowledge and right release are refer to Arahants.
There is a Sutta to support this which I can’t locate it.

4

It’s in MN 117:
“In one of right knowledge, right release comes into being. Thus the learner is endowed with eight factors, and the arahant with ten.” —Thanissaro

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5

That’s also in the op sutta. But what is “right knowledge”?

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