If you've made a challenging selection of a number of objects, you don't want to have to do that again, so save yourself the effort. With the objects selected, go to the Select menu and choose Save Selection. Give your selection an appropriate name and click OK. From then on, if you need to make that difficult selection, just choose it from the bottom of the Select menu. (If you have deleted one or more objects from the page, whatever objects remain in that saved selection will be selected.)
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