Add missing hyphens.

Add excalidraw sources.

Update next steps with more precise description of tricky case.

Final proofreading.

Second round of proofreading.

First pass of proofreading.

Add conclusion.

Describe case 2.

Describe case 6.

Describe case 5.

Describe case 4.

Describe case 3.

Describe case 1.

Add GitHub action for running tests.

Update package name.