I’m going to try to go the other way, and see if I can get 4 textbooks from this: (If somebody wants to help, I’d be really glad)
AABQD010L76223CEGD72FI5DPBOJJMO+
B51BIQPGS206HD
00LB269G
D02315CPQAWDF0B~IL7KB1FG+A
I’ll asume 00LB269G is “Genki 1”
And AABQD010L76223CEGD72FI5DPBOJJMO+ “A Dictionary of Basic Japanese Grammar”
What can B51BIQPGS206HD and D02315CPQAWDF0B~IL7KB1FG+A be?