NOT AS ... AS/ AS ....AS

 http://elcursoinglesonline.blogspot.com/2012/01/comparatives-asas-tancomo.html

https://www.espressoenglish.net/comparative-adjectives-not-as-as/

https://first-english.org/english_learning/english_year_2/as_as_than/45_not_as_as_english_exercises.htm

https://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjectives_comparison_as_as.htm