ass="ruby-identifier">ct</span> }.<span class="ruby-identifier">values</span>.<span class="ruby-identifier">max_by</span>(<span class="ruby-operator">&amp;</span><span class="ruby-value">:size</span>).<span class="ruby-identifier">first</span>
    <span class="ruby-identifier">defaults</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-constant">RubyXL</span><span class="ruby-operator">::</span><span class="ruby-constant">ContentTypeDefault</span>.<span class="ruby-identifier">new</span>(<