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spec: While BSP tree has two child node pointers at each node , ( that 's why it 's called binary tree ) TSP has three child pointers at each node . While Inferno quite naturally complements the look and style established in Suspiria , it 's somewhat subdued by comparison , perhaps taking its cue from Argento 's deliberately paced mystery / thriller Deep Red , with which it shares quite a bit ( the protagonists share a passion for music , while their vocations are both amusingly misinterpreted by women they meet ; Gabriele Lavia appears in both films as a character named `` Carlo , '' and so on ) . if you are using an older version of MSWordTM on a Macintosh you will need to convert the images to a PICT . A tree_if contains three tree node lists : the header , the then_part , and the else_part .