- APL. Trying to finally complete everything in Mastering Dyalog APL [1]. It's a long book.

- Complicated regular expressions

- Urdu

- Thomas Asbridge's The Crusades [2]

[1] https://www.dyalog.com/uploads/documents/MasteringDyalogAPL....

[2] https://www.amazon.com/Crusades-Authoritative-History-Holy-L...