<Route exact path="/" component={Home} />
                  
                  
                            <Route path="/prices" component={Prices} />
                  
                  
                            <Route path="/calc" component={Calc} />
                  
                  
                            <Route path="/articles" component={Articles} />
                  
                  
                            <Route path="articles/:url" component={Article} />
                  
                  
                          </Switch>
                  
                  
                  
                  
                  
                  ——
                  
                  
                  <ul className="articles-list">
                  
                  
                          {data.map( (article, index) => <li key={index}><Link to={`/articles/:${article.url}`}>{article.title}</Link></li> )}
                  
                  
                  </ul>
                  
                  
                
<Route path="/articles/:url" component={Article} />
<Route exact path="/articles" component={Articles} />
<Link to={/articles/:${article.url}}> : Лишнее
Роутер и роут это разные вещи
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