You "lost count" of 0? Because I just downloaded every chapter and searched for "authenticity" it occurred 0 times.
Edited to add where I got the chapters from: I gather the chapters from another posters link https://www.cde.ca.gov/ci/ma/cf/
Edited to add where I got the chapters from: I gather the chapters from another posters link https://www.cde.ca.gov/ci/ma/cf/