Understanding the meaning of scenes

Hello people, can some one kindly clarify why there are 24 scenes created at element level? i understand how sequences are arrived at but am not sure how scenes get to 24. i thought there would be 16 scenes per act as opposed to 6 scenes per act. am saying this because the dramatica structure from class to element shows 16 elements in each act. Please help

Melanie discusses it here in one of her posts and follows that up with this post as well which discusses the differences between 28 and 24 scene acts.