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  1. or download this
        {
            # body
    ...
                if  ...;
            # tail
        # post
    
  2. or download this
        {
            # body
    ...
            # body
        } until( ! ... );
        # post
    
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    # bare block "loop":
    
    ...
            # body
        }
        # post
    
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        {
            # top
    ...
            # tail
        END:
        # post
    
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    LOOP: {
       try something;
    ...
            if  failed;
        sleep $seconds;
    }
    
  6. or download this
        while(  ! try_something()  ) {
            sleep $seconds;
        }