Display flex items vertically in Bootstrap 4

To display flex items vertically, use the flex-column class in Bootstrap 4 ?

Now set the flex-items in it ?

  
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Let us see an example to learn how to learn how to display flex-column class ?   
Example

  
    
    
    
    
    
    
  

  

    

Example of Flex Column
    
Stating the usage of flex column class:
    

      
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