At top, Image 1 shows 2 C's connected by 2 lines. Each C is connected by single lines to 2 H's. At bottom, two dots and 12 C's in a line, each connected to the others before and after with single lines. Each C is connected by single lines to 2 H's, 1 above and 1 below.
Which best describes what is represented by images 1 and 2?