This directory contains examples for the 'chem' language. You can view the graphical display of the examples by calling @g@chem | groff -p ... On the displays, you can see rings consisting of several lines and bonds (lines). All points on rings and bonds that do not have a notation mean a C atom (carbon) filled with H atoms (hydrogen) such that the valence of 4 is satisfied. For example, suppose you have just a single line without any characters. That means a bond. It has two points, one at each end of the line. So each of these points stands for a C atom, the bond itself connects these 2 C atoms. To fulfill the valence of 4, each points has to carry additionally 3 H atoms. So the single empty bond stands for CH3-CH3, though this combination doesn't make much sense chemically. ####### License Copyright (C) 2006-2020 Free Software Foundation, Inc. Written by Bernd Warken . This file is part of 'chem', which is part of 'groff'. 'groff' is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. 'groff' is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. The GPL2 license text is available in the internet at . ##### Editor settings Local Variables: fill-column: 72 mode: text End: vim: set textwidth=72: