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幫我找到一個元素的xpath，我想在第二個元素中找到@ class =「tipN button greenB」 2]其中有@類= 「middleNav」如何找到一個元素的xpath或CSS，哪個classname與其他元素相同
<div id="rightSide">
<div class="topNav">
<style type="text/css">
<div class="resp">
<div class="titleArea">
<div class="wrapper">
<div class="pageTitle">
<div class="middleNav" data-bind="visible: showAllButtons" style="display: none;">
<a id="saveformtop" class="tipN button greenB" data-bind="click: SaveForm, visible: showGridButtons" original-title="Save Staff data" href="#" style="margin: 5px; display: none;" novalidate="novalidate">
<a class="tipN button greenB" original-title="Save Staff data" href="#" style="margin: 5px;" data-bind="click: SaveRestrictions, visible: showRestriction">
<a id="cancelbtntop" class="tipN button redB" original-title="Cancel all edits" data-bind="click:CancelForm, visible: showGridButtons" style="margin: 5px; display: none;">
<a class="tipN button redB" original-title="Cancel all edits" data-bind="click: CancelRestriction, visible: showRestriction" style="margin: 5px;">
<div class="clear"> </div>
</div>
<div class="middleNav" data-bind="visible: !showAllButtons()" style="">
<a id="cancelbtntop" class="tipN button redB" original-title="Cancel all edits" data-bind="click:CancelForm, visible: showGridButtons" style="margin: 5px; display: none;">
<img class="icon" src="../../content/css/images/icons/light/arrowLeft.png" alt="">
<span>Back</span>
</a>
<a class="tipN button greenB" original-title="Save Staff data" href="#" style="margin: 5px;" data-bind="click: SaveRestrictions, visible: showRestriction">
<img class="icon" src="../../content/css/images/icons/light/check.png" alt="">
<span>Save</span>
</a>
<a class="tipN button redB" original-title="Cancel all edits" data-bind="click: CancelRestriction, visible: showRestriction" style="margin: 5px;">
<div class="clear"> </div>
</div>
</div>
</div>
<div class="clear"> </div>
<div class="line"> </div>
<div>
</div>
<div id="footer">
<style>
<div id="leftsidehide" style="display: none;">
</div>