is relatively more stable than that with chirality (4, 4), however, this stability order changes after adding H. For C chains, two-side H-saturated is more stable than pure and one-side Hsaturated chains. Similarly, for 2D systems, both the ANN potential and DFT consistently rank the structures, with graphene being more stable than all graphyne-X structures. Among the graphynes, graphyne-1 is the most stable, followed by graphyne-2 and then graphyne-3.