The attorney response below is correct. However, if you go to a law library, you can find the Miller & Starr treatises on California real estate, which will be a good place to start You might also find some treatises there on Landlord Tenant law. In those books you will find citations to cases in which you will find discussion of the common law. Good luck.
This is not the forum for homework help. You need to go to a law library and do research. Look at Black's Law Dictionary as well as Blackstone's Law Commentaries. Good luck.
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The typical "common law" defenses are largely illusory. In Sacramento, you can visit a law library. AmJur or CJS are "compendiums" of the law, and so are far easier to read than case law. Ask the librarian for either or both of those collections and consult the index. Very well organized.
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