Click a piece that has a tall vertical rectangle on the left side and then a small diagonal piece that sticks out on the lower right.  Do not touch anything else That is wrong.  De-select it and do not touch anything else Click the piece that has a tall rectangle on the left side.  The left side is perfectly straight and vertical, and the bottom is perfectly flat.  On the right side there is a small arm sticking out diagonally
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That is completely wrong.  De-select and start paying attention!  Do not touch anything else