Latex 上下标

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强制右下，右上

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\makeatletter    
\DeclareRobustCommand{\textsupsub}[2]{{%     
  \m@th\ensuremath{%     
    ^{\mbox{\fontsize\sf@size\z@#1}}%     
    _{\mbox{\fontsize\sf@size\z@#2}}%     
  }%     
}}       
\makeatother
X\textsupsub{ab}{c}X\textsupsub{c}{ab}X. 
\textsubscript.  
\textsuperscript.