Prop2 Class 6 - Deeds & Warranties
Prop1 Class 6 - Bundle of Sticks!
Prop2 Class 5 - Implied Warranty
Prop1 Class 5 - Property in Yourself
Prop2 Class 4 - Contract of Sale II
Source:
http://joshblackman.com/blog/2013/09/11/unprecedented-is-ranked-1-2-3-on-kindle/