For example, the directed path leading from (1,1,0) to (0,0,1) gives ䷨ hexagram #41, Reduction. Reversing the direction of the path produces ䷩ hexagram #42, Increase.Each of the eight vertices has seven outbound paths to each of the other vertices, totaling 56 paths. Half of these paths are duplicates, in the sense that the paths connect the same pair of trigrams; thus, the 56 paths comprise 28 pairs of heterogenous* hexagrams. Each vertex can also loop back to itself. These 8 loops constitute 4 pairs of homogenous* hexagrams. An outbound path and its reversal constitute a Wen Pair; loops at antipodal corners (e.g. the example given above) also designate Wen pairs.
*The terms heterogenous and homogenous (applied to hexagrams) refer to the constituent trigrams
Given the yao-numbers derived from Wen's hexagram pairs, we are enabled to assign a weighting to each path, and treat the paths as proper vectors.