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> vimtutor is to Babbel what this is to duolingo

It took me half a minute to realize that you probably meant "vimtutor is to VIM master what Babbel is to duolingo".

Isn't it exactly the same thing? If a:b=c:d then a:c=b:d.

The problem is that it's not the relationship between vimtutor and Babbel that you're comparing to the relationship between vimmaster and Duolingo.

Thats exactly what I meant to say. Thanks!