Which subject book is covered by Black colored paper?

Commerce book is placed at the top of the stack having thickness 77mm and is covered by Pink color. The book covered by a black paper is placed at the bottom of the stack. There are 2 books between Reasoning and book having 55mm thickness. And Reasoning book is placed below book having 55mm thickness. Book having 33mm thickness is placed immediately above book having 55mm thickness, which is covered by  white colored paper. Therefore, Case – 1 and Case – 2 arise because position of books having 33mm and 55mm is not clear. Case-1 There are 2 books between English and Computer books Computer book is covered by Green colored, having thickness 22mm.There are 2 books between Science book and book having 11mm thickness. Science book is place above the book having 11mm thickness. Therefore, Case – 1(a) and Case – 1(b) arise because position of English book is not clear. Case-1a CASE-1B