have what is DOESNT? ;

give DOESNT is an esolang
unless DOESNT , is , an , esolang 
     , a , rewriting , system 
     , that , which , what is left !! , not , taken 
     , where , everything , backwards 
     , it , left , untaken , DOESNT. ;

give a rewriting system
unless DOESNT , is , what is left !! 
      , a , rewriting , system , where , everything , backwards 
      , left , untaken , it , is , DOESNT. ;

give where everything is backwards
unless DOESNT is an !! , what is left !! 
     , where , everything , is , backwards , 
     , left , untaken , it , is , DOESNT. ;

give it is what is left untaken
unless DOESNT , is , an , esolang , a , rewriting , system
     , it , what , left , untaken , DOESNT. ;

give DOESNT.
unless DOESNT. , what , is , DOESNT? 
     , DOESNT , an , esolang , a , rewriting , system 
     , where , everything , backwards ;