Question: I have these lines;

```
Question1. Is this true?
a. Yes
b. No
Question2. How is the weather
a. Good
b. Bad
Question3. The sky is
a. Dark
b. Blue

```

I wanted to change it to;

```
Question1. Is this true?
a. Yes
b. No

Question2. How is the weather
a. Good
b. Bad

Question3. The sky is
a. Dark
b. Blue

```

Is it possible to do this with a one liner command on Vim(version 81)?

Answer: 
Command `o` will get you to the "other" end of the Visual selection.

See [`:help v_o`](https://vimhelp.org/visual.txt.html#v_o):

> 
> Go to Other end of highlighted text: The current cursor position becomes the start of the highlighted text and the cursor is moved to the other end of the highlighted text. The highlighted area remains the same.
> 
> 
> 

When you're in Visual Block mode, there's also `O` which takes you to the other corner on the same line (since Visual Block mode selects a rectangle), which you can use together with `o` to move to any corner of the selection.
If you want to move to the beginning or end of a paragraph of text, you can use `}` and `{` respectively.

When in visual block mode, you can use `{` to move back to the beginning of the selection, but this deselects the text. The command to reselect the previous visual block `gv` can be used.

[For reference, the vim manual entry.](http://vimdoc.sourceforge.net/htmldoc/motion.html)