recycle bin
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There are 16 pictures in the pile under the heading 1.
Of those 16 pictures there are 6 matching pairs of pictures.
You can spread the pictures out under all of the headings and those which make pairs drop into the grid.
Those which you don't want to use you can drop into the recycle bin.
If you change your mind you can always recycle them.
Drag in the last picture to complete the activity.
To restart the activity just refresh the page.