The dependency diagram in Figure Q$6\mathrm{.}7$ indicates that authors are paid royalties for each book they write for a publisher. The amount of the royalty can vary by author, by book, and b edition of the book.

a$.$ Based on the dependency diagram, create a database whose tables are at least in $2$NF$,$ showing the dependency diagram for each table.

b$.$ Create a database whose tables are at least in $3NF,$ showing the dependency diagram for $e$ table.