front, front1, front2...
This question is regarding front and back as used in extract variables.
The documentation states that you can separate multiple variations using "|", so what's the point of having front1, front2 and so on? Wouldn't just "front" be enough? What's the difference between:
front = a|b
Also, what if front5 doesn't exist? Will front6 and the ones following still be taken into accout?