Find association rules with hierarchies, based on: https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.64.3214&rep=rep1&type=pdf
Example in the paper:
L[ (1, 1) ] =>
{'1': 5, '2': 5, '3': 3, '4': 3, '5': 2, '7': 1}
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L[ (1, 2) ] =>
{('1', '2'): 4}
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L[ (2, 1) ] =>
{'11': 5, '12': 4, '21': 4, '22': 4}
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L[ (2, 2) ] =>
{('11', '12'): 4, ('11', '21'): 3, ('11', '22'): 4, ('12', '22'): 3, ('21', '22'): 3}
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L[ (3, 1) ] =>
{'111': 4, '121': 2, '211': 4, '221': 3, '222': 1, '112': 1, '122': 2}
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L[ (3, 2) ] =>
{('111', '211'): 3}
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It is not printing L[2,3], feel free to try.