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
page2-61.png page1-105.png page6-180.png page5-102.png
page4-215.png page6-180.png page2-61.png page7-234.png page1-105.png page5-102.png page6-155.png page6-112.png page3-123.png page2-23.png
That is wrong.  De-select it and do not touch anything else