impl multiline comment
not working notComment1
working version, consume one char to keep going
3.4.1 the nature of time in concurrent systems
slight change on comment
6.1 - done
lambda parser
3.4.1 - done
ex 3.38.a - done
ex 3.38.b - done
3.4.2
3.4.2 - till "serializing access to shared state"
3.4.2 - test parallel-execute

I might change impl for a while...
use racket, concurrent primitive impl & test
ex 3.39 - done
ex 3.39 - clearer answer
let's try to make some monad by ourselves
ex 3.40 - case #1, + part of #2
ex 3.40 - all combinations ..
ex 3.40 - reduce to 7 cases