Mac: How to add alternative lines in Excel etc

if you have a column
36166
19764
37658
36244
29998

How can you transform it to
36166


19764


37658


36244


29998

?

The answer is using TextEdit.


1. Open TextEdit
2. Copy a line break (the part between the end of 36166 and the start of 19764)
3. command + f, paste the line break in the searching area, check replace
4. Paste the line break twice in the second box to replace one line break with two line breaks. In this way you will insert one line after each original line.  To get more line breaks, do the same.