nothing between strida 3 and strida 5 - where is version 4 ?

hello. why did they jump from 3 to 5 ? where can i find a survey of all versions and subversions? thanks a lot.

Stridas are manufactured in Taiwan since version 3. I think the version of Strida jump from 3 to 5 because “4” is an unlucky number which pronounces similar to “die” in Chinese.
You can see the same case in the development of Palm PDAs. There was Palm III and Palm V series but no palm IV. :unamused: