I'm trying to set tab stops in LaTeX in the tabbing environment. My problem is that I want to set a tab stop after a number of whitespaces. The problem is that LaTeX of course ignores multiple whitespaces, and it seems to only support setting tab stops after actual text.

What I would like to be able to do is format the arrows below so that they line up together. 

A   -> B
CD  -> A 
BDD -> F

The problem is that the extra spaces after the characters on the left of the arrows are ignored for the purposes of setting the tab stop. What is the solution?

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