LESSON LINK: Link
If you want to set a boundary for a variable or etc. you can use .. or ... to set them.
For example, let's say you wanted to set a boundary for the numbers 1~5. Then you could either do:
1..5 or 1...6.
The 1..5 displays until 1~5 and 1...5 displays up to 1~4.
You could also use this for alphabet letters.
Hope this helps.
Sincerely yours, Admin
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