x_{1} is the node of present concern/is the current position in graph x_{3} (not necessarily oriented; notice the terbri number), connected (possibly indirectly) to/with other nodes x_{2} (possibly incomplete set) via (oriented) paths x_{4}

"Current position" is in thought. See also: grafu, tcanaba, tcanapu.

- tcanaba
- x
_{1}(node/vertex/station) is forward of/along from x_{2}in oriented graph x_{3}(graph with orientation) using oriented edge path x_{4}(ordered sequence of ordered pairs). The path from x_{2}to x_{1}runs along/is coparallel with/downstream of the orientation on x_{3}along path x_{4}. - tcanapu
- x
_{1}(node/vertex/station) is backward of/along from x_{2}in oriented graph x_{3}(graph with orientation) using oriented edge path x_{4}(ordered sequence of ordered pairs; oriented edges). The path from x_{2}to x_{1}along the (now-unoriented version of the) edges used in x_{4}is counter/against/upstream of the orientation of x_{3}(and/or given by the oriented version of x_{4}).