Errata:
The pattern has an error: “After the 18th cable is worked decrease…”. This seems far too late in the pattern to start decreasing. And when you then read “having reached the 13th cable” and “continue now until there are 19 cables” it suggests that “After the 18th cable is worked decrease…” should actually read: “After the 8th cable is worked decrease…”. Further details.

Note: This pattern has since been taken offline, but, you can get at it through the Wayback Machine Internet Archives. I’ve updated the links to it, and downloaded both the pattern and errata as a PDF.