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1.414213562373095048801688724209

1.732050807568877293527446341505

➎; x;

(approach, line of action, policy, position, principle);
beam (e.g. X-ray);
(line, track);
contour, form, outline;
division;
level;
(railroad track, route, lane);
stripe;
wire (e.g. telephone line);

content type e.g. all, document, Font, image, Media, other, Script, style sheet, XHR, ... ;

                   
                   
                   
                   
         
X H T M L ,        
extensible hyper text markup language ( xhtml )  
            xhtml ;    
         
x html ;        
            1 . 0 ;
          xmlns ;    

...

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