:PROPERTIES:
:ID:       063dfd73-dbf5-437b-b6f1-d7aeca196f31
:END:
#+title: Spaced repetition
#+date: "2021-04-07 18:19:11 +08:00"
#+date_modified: "2021-05-04 20:51:18 +08:00"
#+language: en