Preorder-Tree-Walk(x)
{"Image DocumentName": "Preorder-Tree-Walk(x)", "Image ImageDescription": "if (x != NIL) then. Print (key(x)) Preorder-Tree-Walk( left(x)) Preorder-Tree-Walk( right(x))", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}