create: ALEX_prototype.ipynb

create: v2.3_ALEX_prototype.ipynb

create: v2.2_ALEX_prototype.ipynb

update: v2.0_ALEX_prototype.ipynb

update: v2.1_ALEX_prototype.ipynb

create: ALEX_prototype.ipynb

update: v2_ALEX_prototype.ipynb

create: cefr_leveled_texts.csv, oxford-5k.csv

create: ALEX_prototype.ipynb