\documentclass{ppex}
\nonstopmode
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\usepackage {locant,carom}
\pagestyle{empty}

\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {locant,carom}
%\origpttrue
\begin{picture}(1500,1600)(0,-200)
{\small
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1Sb==1Sb(l);1Sa==1;2Sb==2Sb(l);2Sa==2Sa(l);%
3Sb==3Sb(l);3Sa==3Sa(l);4Sb==4Sb(l);4Sa==4;%
5==5;6Sb==6;6Sa==6Sa(r);7Sb==7Sb(r);7Sa==7Sa(r);8==8;9==9;%
{{10}}==10;{{11}Sb}==11Sb(l);{{11}Sa}==11;%
{{12}Sa}==12;{{12}Sb}==12Sb(l);{{13}}==13;{{14}}==14;%
{{15}Sa}==15Sa(r);{{15}Sb}==15Sb(r);%
{{16}Sa}==16Sa(r);{{16}Sb}==16Sb(r);%
{{17}Sa}==17Sa(r);{{17}Sb}==17}}}%
{\footnotesize
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\end{document}