A researcher who learns by breaking things. The 1 needs solid ground under it, and the 3 finds out what is solid by falling through what is not.
Conscious line 1: You consciously need to know. Uncertainty is uncomfortable in a specific way: not anxiety exactly, but the sense that you cannot move until you understand the foundation.
Unconscious line 3: Unconsciously you are trial and error. Things break around you, and other people read that as bad luck when it is actually the mechanism working.
The two lines together
The pairing is self-contained. You research something thoroughly, commit, discover experimentally that part of it does not hold, and integrate that into a deeper foundation. It is slow, and it produces genuine authority.
The hard part is that the 3 keeps interrupting the 1's need for certainty. Every discovery that something does not work feels like a failure of the research, when it is the next stage of it.