****** Empty tree ***** Empty tree. ****** Elements ****** 30 30 19 19 14 10 2 0 0 0 -5 -10 ****** Elements ****** 30 19 19 14 2 0 0 -5 ****** Element counts The count of 30 is 1. The count of 0 is 2. The count of -9 is 0. ****** Smallest ****** The smallest integer is -5. For an empty tree, ● print () prints "Empty tree." to the console. smallest () terminates the program by failing assert condition.