4 ms·

Since there is no explanatory text, this seems to be more of a testing environment than a primer.

• deleted 7y ago
  [deleted]
• andywhite37 7y ago
  Try looking again - maybe you caught a version that didn't render correctly. There is actually quite a bit of explanatory text, and it's quite good!
  • bokumo 7y ago
    Thank you, you are correct.