[split] (lack of) word groups

[Koen G]

I collected some numbers already, you can see them here (final sheet xMATTR):
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Of the texts I checked so far, here's the percentage that have no repeating strings of the following lengths:

2: 1% 
3: 6% 
4: 20% 
5: 32% 
6: 48% 

So about half of these texts never repeat a string of 6 words exactly (taking into account the 1000-word window I always used, which seems reasonably large). 
What may be more interesting is that 9 of my txt files never even repeat a 4-word string. 

Additionally, one file (attached) does apparently not even repeat 3-word strings. It's only 1762 words, which might explain a bit.

Still, I would seriously question the claim that natural languages cannot be without repeating "phrases". If the phrase is 4 words long, I have 9 counterexamples. Make the phrase 5 words long and 20% of checked texts don't repeat any.