You can superscript and subscript text in a text block.
To superscript or subscript text:
Double-click within the text block and select the text you want to change.
Choose from three ways to apply these attributes:
Click the appropriate graphic on the Text group on the Home ribbon:
                                     
                                 | 
                                ASuperscript | 
                                     
                                 | 
                                ASubscript | 
Right-click, and select the appropriate attribute from the Font submenu:
| 
                                     Font > Superscript  | 
                                
                                     ASuperscript  | 
                            
| 
                                     Font > Subscripts  | 
                                
                                     ASubscript  | 
                            
Type the appropriate keyboard shortcut:
| 
                                     Alt+4  | 
                                
                                     ASuperscript  | 
                            
| 
                                     Alt+5  | 
                                
                                     ASubscript  | 
                            
            
                    
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