Now the current block configuration is: - Stack with red block, purple block, green block, blue block, yellow block, from bottom to top The action "move(yellow,table)" is valid. We execute this action. Now the current block configuration is: - Stack with red block, purple block, green block, blue block, from bottom to top - Stack with yellow block The action "move(blue,table)" is valid. We execute this action. Now the current block configuration is: - Stack with red block, purple block, green block, from bottom to top - Stack with yellow block - Stack with blue block The action "move(green,table)" is valid. We execute this action. Now the current block configuration is: - Stack with red block, purple block, from bottom to top - Stack with yellow block - Stack with blue block - Stack with green block The action "move(purple,table)" is valid. We execute this action. Now the current block configuration is: - Stack with red block - Stack with yellow block - Stack with blue block - Stack with green block - Stack with purple block The action "move(yellow,purple)" is valid. We execute this action. Now the current block configuration is: - Stack with red block - Stack with blue block - Stack with green block - Stack with purple block, yellow block, from bottom to top The action "move(purple,blue)" is invalid and cannot be executed, because the purple block is below the yellow block and cannot be moved. The action sequence is therefore invalid, so we stop analyzing here.

No