Loot list hierarchy ?

Hello, i have questions about the loot.

There is 4 loot list available for 1 raidable base : Base_loot , difficulty_loot, weekday_loot and default_loot.
i can not find the spawn hierarchy between these loots list ? wich loot list spawn before the next one ?

i thought base loot was the 1st, then difficulty, then default, but it seems it randomly change hierarchy. (i don't use weekday, so my concern is mainly between base_loot, difficulty_loot and default_loot.)

anyone ?