above is beginning of file repeated newline

 beginning single space
ending single space 
    beginning repeated spaces
        beginning repeated spaces
ending repeated spaces    
ending repeated spaces        
	beginning single tab
ending single tab	
			beginning repeated tabs
ending repeated tabs			
 	beginning space tab
ending space tab 	
  	beginning space space tab
ending space space tab  	
	 beginning tab space
ending tab space	 
	  beginning tab space space
ending tab space space	  

123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 
this is a long line. what's “long” is determined by fill-column, not by window width.


 long long long long long long long long long long

LongLineNoWhiteSpacettttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt

                  this is a long line with beginning and ending repeated spaces long long long long                


following is end of file repeated newline