you have the wrong solution
if we check it on all possible triplets permutation for first test, then as a secrets we get

defaultdict(<class 'int'>, {'whatisup': 2565, 'tuwhapis': 120, 'uwhatpis': 76, 'twhapisu': 240, 'twhuapis': 6, 'twhapuis': 26, 'whatupis': 79, 'whatpisu': 660, 'whuatpis': 9, 'whatpuis': 16, 'twhaisup': 180, 'twhaupis': 28, 'whatipsu': 285, 'wuhatisp': 35, 'wuhiatsp': 88, 'whiuatsp': 71, 'whiatsup': 195, 'whuatisp': 18, 'whuiatsp': 10, 'uwhatisp': 7, 'uwhiatsp': 11, 'whatiusp': 30, 'whatuisp': 30, 'whiatusp': 60, 'twhiapsu': 60, 'whiatpsu': 75, 'twhiasup': 60})

Hi
help me please
how is it that the getitem function call adds items to the dictionary?