Merge Academy all spaces filled

You can click on an item and at the bottom of the screen it tells you what you can do with it.  Before you merge items twice or more, you can put them in the trash. For instance, spawn a feather or a page from the book, or a log from the tree.  Click on the item.  At the bottom, you will see a tiny red trash can icon.  However, instead of using the trash can, merge as many items as you can and sell them.  Simply click on an item and if it is eligible to be sold, instead of the trash can you will see a small purple box with a 1, 2, or 3 in the box.  That is how much the item is worth.