[coldtea]

>Well of course you can't include languages like Haskell in the group of interchangeable languages.

Well, if you can only include "interchangeable languages" then it's not an observation but a tautology.

[ruleabidinguser]

No kidding? What I was trying to say (I thought I was pretty clear) is that we're really only considering institutional languages here. As it turns out to my knowledge theyre basically all the same.