Regarding the form 'x(x)': I stand by my assertion that neither NUG nor CF 
prohibit such a construction for a variable that is not intended to be a 
coordinate variable. Such a form is not recommended, but it is not prohibited. 
I fully believe and agree that this was the intention in CF (I don't know about 
NUG), but the language does not implement the intention. While not recommended, 
CF also allows auxiliary coordinate forms such as 'x(x,l)'.

If the majority agree that we should prohibit such forms, it requires a change 
to the conventions. We can call that correcting a defect or making an 
enhancement. I am good either way.

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