\centerline{ \structure{\phantatom{C} % The \phantatom just processed defines the central empty spot, % from which all the bonds spray out; each one of the following % \side{...} commands will generate one direction. The rules % for \side are explained in chapter 27.3 . \side{\wsingle\phantatom{C}\wdouble\phantatom{C}\wtriple \atom{\tt W}} \side{\esingle\phantatom{C}\edouble\phantatom{C}\etriple \atom{\tt E}} \side{\ssingle\phantatom{C}\sdouble\phantatom{C}\striple \atom{\tt S}} \side{\nsingle\phantatom{C}\ndouble\phantatom{C}\ntriple \atom{\tt N}} \side{\swsingle\phantatom{C}\swdouble\phantatom{C}\swtriple \atom{\tt SW}} \side{\sesingle\phantatom{C}\sedouble\phantatom{C}\setriple \atom{\tt SE}} \side{\nesingle\phantatom{C}\nedouble\phantatom{C}\netriple \atom{\tt NE}} \side{\nwsingle\phantatom{C}\nwdouble\phantatom{C}\nwtriple \atom{\tt NW}} \side{\nnwsingle\phantatom{C}\nnwdouble\phantatom{C}\nnwtriple \atom{\tt NNW}} \side{\nnesingle\phantatom{C}\nnedouble\phantatom{C}\nnetriple \atom{\tt NNE}} \side{\ssesingle\phantatom{C}\ssedouble\phantatom{C}\ssetriple \atom{\tt SSE}} \side{\sswsingle\phantatom{C}\sswdouble\phantatom{C}\sswtriple \atom{\tt SSW}} } \hskip 1truecm \structure{\phantatom{C} \side{\wnwbelow\phantatom{C}\wnwabove\phantatom{C}\wnwevoba \atom{\tt WNW}} \side{\enebelow\phantatom{C}\eneabove\phantatom{C}\eneevoba \atom{\tt ENE}} \side{\wswbelow\phantatom{C}\wswabove\phantatom{C}\wswevoba \atom{\tt WSW}} \side{\esebelow\phantatom{C}\eseabove\phantatom{C}\eseevoba \atom{\tt ESE}} \side{\swbelow\atom{\tt SW}} \side{\sebelow\atom{\tt SE}} \side{\nebelow\atom{\tt NE}} \side{\nwbelow\atom{\tt NW}} \side{\nnwbelow\phantatom{C}\nnwabove\phantatom{C}\nnwevoba \atom{\tt NNW}} \side{\nnebelow\phantatom{C}\nneabove\phantatom{C}\nneevoba \atom{\tt NNE}} \side{\ssebelow\phantatom{C}\sseabove\phantatom{C}\sseevoba \atom{\tt SSE}} \side{\sswbelow\phantatom{C}\sswabove\phantatom{C}\sswevoba \atom{\tt SSW}} } } \medskip \centerline{\bf Figure~1. \rm All available in-plane and out-of-plane bonds.}