helpful update posted for Lab 3b (plus minor updates for others)

Based on our troubleshooting experience with the new Flow version of 3b so far this Fall, we've made several clarifying tweaks to that lab that should help students have a smoother experience.

While we were at it, we did the same for 1a, 1b and 3a, too.

The 1a, 1b, 3a and 3b files in the Google Drive folder have been updated in place so you can just download them again now to have the new version.

Here's the link again so you can go directly there now:

https://drive.google.com/drive/folders/1RBHnDguzb8Jas79nXgaKoXyt5BCRs4M3?usp=sharing

None of these updates change anything the students do–these are merely tweaks to wording or the embedded screencaps to make things clearer. But they should make life easier for students and our troubleshooters too!

So thank you for getting these into your students' hands. Apologies for the hassle. We really appreciate your support!