definition of `six` is different to other numbers

[aclueless]

Synset

• ID: oewn-02194472-s
• Lemma: six

https://en-word.net/lemma/six

New definition

• being one more than five

Motivation Similar to other numbers such as:

• four: being one more than three
• five: being one more than four
• ...

[jmccrae]

There seems to be a similar issue with 9, 12 and 20