[Learn]: Why does the program lock on me after a few times.


**Step Number:** `13`
**Step Name:** `examples.range.title`
**Language:** `en`
**Version:** `v2.34.2`



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**What is the problem you are experiencing?**
After a few screens, the "lock" icon closes (in the bottom right corner of the screen) & I can go no further.  Why?

