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This is pretty easy on a Mac. First of all, launch preview (finder>applications>preview) and open the pdf file. Second, if thumbnails are visible, just click the thumbnail of the pdf you want to merge and drag it to the thumbnail of the pdf you want to merge it with and it will automatically be added to the end of the destination pdf. Make sure to select “file” and “export as pdf…” and save the combined file. That should take care of it, although if thumbnails aren’t visible, you will need to click “view > thumbnails” to make them visible before you can do the second step.