VLERange: a range in between BidirectionalRange and RandomAccessRange

[Walter Bright]

Nick Sabalausky wrote:
> Those *both* get rendered exactly the same, and both represent the same 
> four-letter sequence. In the second example, the 'u' and the {umlaut 
> combining character} combine to form one grapheme. The f's and n's just 
> happen to be single-code-point graphemes.

I know some German, and to the best of my knowledge there are zero combining 
characters for it. The umlauts and the B both have their own code points.

> legend has it there are others than can only be 
> represented using a combining character.

??? I've never seen or heard of any. Not even in the old script that was in 
common use in Germany until after WW2.