title: How do I remove the first element in a list within a list?
body: <p>I would like to know if there's any way to remove an index in a list within a list. For example, given <code>[[1,2,3],[4,5,6],[7,8,9]]</code>, I would like to remove the the first element of each list so that it becomes <code>[[2,3],[5,6],[8,9]]</code>. I can do a for loop to slowly remove them but I was wondering if there's a more efficient manner to do so?</p>