x1 and x2 are path-linked by directed binary predicate x3 (ka) via intermediate steps x4 (ordered list; ce'o), such that no other node exists in the graph (x5) to which x2 is connected in the same way/direction.
x2 is the root/leaf of the predicate (depending on point of view); it is the ultimate ancestor/descendent node in the graph along the path described by x4 for x1 using relation x3. Not all combinations of x1 nodes and x3 relations and x4 paths have such an x2 node, nor is x2 necessarily unique if only x1 and x3 are specified (the same is true if "x1" and "x2" are exchanged in this second clause of this sentence). Use a SE conversion or other permutation on the arguments of x3 in order to change the perspective (for example: if we call x2 a root, then it *might* be the case that x1 is a leaf). In other words, x2 is *an* ultimate ancestor/descendent of x1, but not necessarily the only/unique one, nor necessarily the most distant one by any given metric (including graph geodesic distance). All other notes are the same as those for ".utka", which should be referenced. In order to make x1 the ultimate node of the relationship in the other direction, exchange the order of the arguments in the predicate x3 and then use "se" on this word.