jordyn/sicpsgjd @ 62b9b481c404751f8cbd466e39742a198c47d035

jordyn 62b9b481c4 3.4 concurrency		5 anni fa
..
1	7947e12756 3.1 assignment and local state	5 anni fa
2	94759818ca 3.2 the environment model	5 anni fa
3	96c13eada5 3.3 mutable data	5 anni fa
4	62b9b481c4 3.4 concurrency	5 anni fa
5	e58cea7a1b sicp	5 anni fa