13.5 time complexity, **17.2**, 19.1-19.6 Timsort, **19.6** traceback, **11.1**, 11.2, 13.3 tracing (hand execution), **17.3**, 18.1 tree (data structure), **20.6**, 18.3 `True`, **3.3**, 4.2 truth table, **4.3**, C.2 truthiness, **4.2**, 3.3 `try`/`except`, **11.2**, 11.3 tuple, **8.6**, 8.7 unpack