 9.1 Binary trees

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Cited passages: Data Structures and Algorithms, section 9.1.1: complete shape and binary heap example; Data Structures and Algorithms, section 9.1.1: full shape and Huffman coding tree example; Data Structures and Algorithms, section 9.1.1: perfect shape, equal leaf levels, and Figure 9.4; Data Structures and Algorithms, section 9.1.2, height pseudocode: null returns -1.