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Please have a look at You are not allowed to view links. Register or Login to view. qokeedy Loop of Death

qokedy dy c'hety qokedy qokeedy qokeeedy lol
qokeedy qokeedy qokedy qokedy qokeedy ldy
yc'hedy qokeedy qokeedy olkeedy otey koldy

To add to Jorge Stolfi's point on duplications naturally arising in language, this sort of duplication occurs at the level of letters and short n-grams, as well, so can also be achieved within a substitution cipher scheme. I'll talk about this more at this year's VMD, but in principle, something like qokedy could be parsed as qok|edy where qok- is one plaintext letter and -edy is another plaintext letter. So something like:

qokeedy qokeedy qokedy qokedy qokeedy

Could be the letter pattern ABABACACAB.

Alternatively, qokedy, qokeedy, and qokeeedy all look distinct, so each could theoretically stand for an individual plaintext letter, which makes the repetition much more reasonable. Because something like:

qokeedy qokeedy qokedy qokedy

Could encrypt something like the Roman numeral MMXX.

 These sorts of approaches are attractive for a variety of reasons, but the fundamental trade-off is that there has to be a lot less meaningful text in the VMS than first impressions would otherwise suggest.