“…At this point one should make a distinction between regular or semiregular tilings where all vertices are equivalent, which are discussed in the present paper, and non-regular tilings, where there are differences among vertices: one such "biphenylene sheet" [42,43] contains 4-, 6-, and 8-membered rings, and has a third of the vertices common to one 6-membered and two 8-membered rings, with the remaining vertices common to one 4-membered, one 6-membered, and one 8-membered ring (therefore in order to make this net planar, these polygons cannot have normal bond angles). From this "biphenylene sheet" one cannot obtain bent or kinked [n]phenylenes, because it contains only linear [n]phenylene fragments.…”