Reading and working my way through "Elements of ML Programming" (ML97 Edition). One of the many programming books I have, that I still want to get through. Slow

Reading and working my way through "Elements of ML Programming" (ML97 Edition). One of the many programming books I have, that I still want to get through. Slowly getting more productive using Standard ML. Once I have good understanding of all the language features, I will probably switch to "Purely Functional Data Structures" and understand its code, which will help me, when I want to write in functional style in other languages and want to avoid any unnecessarily badly chosen data structure, while also avoiding mutation, where it makes sense.