li class="chapter " data-level="4.4" data-path="refguide/transactions.html">
            
            <span><b>4.4.</b> transactions</span>
            
            
        </li>
    
        <li class="chapter " data-level="4.5" data-path="refguide/observe-async.html">
            
                
                    <a href="../refguide/observe-async.html">
                
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                            <b>4.5.</b>
              