Copy List Without Duplications

On Worksheet Data 1 Column I there is a column of data with "some" duplicated text entries.

The data is sorted so that all of the duplications appear in a blocks, i.e.

This is the first
This is the first
This is the first
This is the second
This is the second
This is the third
This is the third
This is the third
This is the third
This is the fourth
This is the fifth

I want to -
Starting in Worksheet Data1 cell I4
Copy A4 to Worksheet Data2 cell A4

Then go back to Worksheet Data1 cell I4 drop down to cell I5 and if the data is the same as the data just copied drop down a cell and keep going until it reaches a cell with different non duplicated data.

Then Copy that cell to Worksheet Data2 cell A5

So that I end up with a list of data with no duplications.