IMHO grandparent is saying Linear B is a different, yet related script that appears to be directly derived from a regional variant of Linear A. A script can be

IMHO grandparent is saying Linear B is a different, yet related script that appears to be directly derived from a regional variant of Linear A. A script can be used to write arbitrary languages, and does not imply a fully identical mapping to phonemes when used for these different languages. Examples include use of the Arabic script[0] to write Uighur, Urdu, or Farsi. Generally an existing script is adopted for a new language through transliteration, often the addition of diacritics or new glyphs. Further examples would be Vietnamese or the numerous abugidas of Southeast Asia. When an existing script is used without adaptation by a speaker of another language attempting phonetic transliteration, it is generally very lossy.[2] This is why we have IPA, which is also lossy and not widely understood.[3] [0] https://en.wikipedia.org/wiki/Arabic_script https://en.wikipedia.org/wiki/Arabic_script [1] https://en.wikipedia.org/wiki/Abugida https://en.wikipedia.org/wiki/Abugida [2] https://www.sinosplice.com/life/archives/2013/07/02/the-foreign-feel-of-a-chinese-transliteration https://www.sinosplice.com/life/archives/2013/07/02/the-fore... [3] https://en.wikipedia.org/wiki/International_Phonetic_Alphabet https://en.wikipedia.org/wiki/International_Phonetic_Alphabe...