To delete a pack from the My collection page, tap and hold it, then press the trash bin icon.
You can also delete a pack in the following way:
1. Tap the Settings icon in the upper right corner of the screen
2. Choose Delete packs
3. Tap on the trash bin icon on the pack you want to delete
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i love this game and i want to keep playing it ..but its refusing to delete some pictures from my collection ..please fix it