What does "sandhāvitvā saṃsaritvā" mean in AN 9.12?

I quote from AN 9.12 (trans. Sujato) below, with regards to stream entry. 1. What does "sattakkhattuparama" mean literally and non-literally? 2. What is the meaning of the phrase "sandhāvitvā saṃsaritvā" in this quote? How does it relate to "sattakkhattuparama"? 3. Is the phrase "sandhāvitvā saṃsaritvā" used in other suttas, without being connected to "sattakkhattuparama"? What does it mean there? What is the context there? 4. Can I say that "sandhāvitvā saṃsaritvā" supports the interpretation of "sattakkhattuparama" as "seven lifetimes" or "seven rebirths"? > With the ending of three fetters, they have at most seven rebirths. > They will transmigrate at most seven times among gods and humans and > then make an end of suffering. > > So tiṇṇaṃ saṃyojanānaṃ parikkhayā sattakkhattuparamo hoti, > sattakkhattuparamaṃ deve ca manusse ca sandhāvitvā saṃsaritvā > dukkhassantaṃ karoti.