Hi
Easyslides orders the song by their titles and so if the title for the same songs are the same, or similar, they will be listed beside each other. You just have to go through the songs and remove the duplicated ones.
If you find it hard to compare each song lyrics in the easyslides window, and assuming songs duplicated titles are similar, another method is:
1. Create a new blank database.
2. At the Booklet pane, add all the lyrics you want to check to a new booklet. All the titles will be listed alphabetically.
3. Generate the booklet, open it and go through the lyrics to look for duplicated songs and note the song numbers you want to remove
4. Go back to the booklet panel in easyslides and select all the songs
5. Hold the control key down and click on the song number you noted to be duplicates from step 3 above.
6. After you have untick all the duplicates, the only songs selected are the ones you want
7. Click the copy symbol beside the booklet panel and select the new blank database you had created in step 1. Click OK
8. The new database will now have the songs with the duplicated ones removed.