Lal, can you please translate those lines in Pe 5 Hāravibhaṅgapañcamabhūmi?
Tattha tīṇi saṅkhatalakkhaṇāni tisso dukkhatā uppādo saṅkhatalakkhaṇaṁ, saṅkhāradukkhatāya dukkhatā ca saṅkhatalakkhaṇaṁ, vipariṇāmadukkhatāya dukkhatāti aññathattaṁ ca saṅkhatalakkhaṇaṁ, dukkhadukkhatāya ca dukkhatā
This is about the three sankhata lakkhana and the correlation to the three types of dukkha. I cannot see how dukkha-dukkha is linked to vaya lakkhana.