In the example, notice that there are no selected photos below image 002.jpg (i.e.) 002_selected.jpg is not there in the list which means 002.jpg is rejected by the user.
Now retain the selected photos in the same folder and select all the rejected photos and move them to another folder.
Place the cursor on the folder with selected photos, just right click and select Sort by -> Date modified and Ascending.
Both the original photos as well as the duplicate photos will be separated. Select all the duplicate photos and delete them. Now all the selected original photos are ready for album designing.