Only if you think that prefix-matching implies hierarchy. Are `invoice_2020_10_1.pdf` and `invoice_2020_11_1.pdf` children of their parent in the hierarchy, `i

Only if you think that prefix-matching implies hierarchy. Are `invoice_2020_10_1.pdf` and `invoice_2020_11_1.pdf` children of their parent in the hierarchy, `invoice_2020_1`?