John invents a new type of automobile-tracking system on January 1 and files a patent application for it on June 30. On March 10, Susan invents a very similar system and files a patent application on March 15. Under the America Invents Act, who holds the valid patent?

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.