Arguments & discussions
The logical structure of arguments for what is true (or likely to be true) is branching tree graphs: chains of claims which build on each other in sets of If This, Then That links. E.g.: I think, therefore I am; if I am, then perhaps my persistent apparent perceptions of an outer objective world are reliable and an outer objective world also exists; if the outer world exists, then the apparent other beings within it may also have their own subjective inner experiences like I do; if others also feel pain and joy and the other things I feel, perhaps I should behave in ways that take their experiences into account as well as mine. Etc.
All of our (reasonable) beliefs about what is true are built on such chains of reasoning, of varying degrees of completeness and detail.