2 check-ins using file docs/weeks/5.md version 99d6d56c04

2023-04-26
15:47
elaborate description of tutorial #4 check-in: 3446885b67 user: jboy tags: revise-for-2023
14:09
add (tentative) readings for weeks 4 and 5 check-in: d1b355a6f4 user: jboy tags: revise-for-2023