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<p>我有一个函数的结果列表,列表如下:</p>
<pre><code>lovers=[['Warner', 'Lugar'], ['Warner', 'Murkowski'], ['Warner', 'Smith'], ['Chambliss', 'Allard'], ['Chambliss', 'Isakson'], ['Lugar', 'Warner'], ['Lugar', 'Murkowski'], ['Lugar', 'Smith'], ['Murkowski', 'Warner'], ['Murkowski', 'Lugar'], ['Murkowski', 'Smith'], ['Allard', 'Chambliss'], ['Allard', 'Isakson'], ['Smith', 'Warner'], ['Smith', 'Lugar'], ['Smith', 'Murkowski'], ['Grassley', 'Talent'], ['Grassley', 'Bond'], ['Grassley', 'Allen'], ['Grassley', 'Roberts'], ['Talent', 'Grassley'], ['Talent', 'Bond'], ['Talent', 'Allen'], ['Talent', 'Roberts'], ['Durbin', 'Sarbanes'], ['Bond', 'Grassley'], ['Bond', 'Talent'], ['Bond', 'Allen'], ['Bond', 'Roberts'], ['Allen', 'Grassley'], ['Allen', 'Talent'], ['Allen', 'Bond'], ['Allen', 'Roberts'], ['Sarbanes', 'Durbin'], ['Roberts', 'Grassley'], ['Roberts', 'Talent'], ['Roberts', 'Bond'], ['Roberts', 'Allen'], ['Isakson', 'Chambliss'], ['Isakson', 'Allard']]
</code></pre>
<p>我想把这个列表转换成有重复项的列表。i、 如果<code>['Warner', 'Lugar']</code>已经存在了,那么我不想要<code>['Lugar', 'Warner']</code>。我该怎么做?你知道吗</p>