These notes were prepared for my research group in 2014. These results are not new. Most appear in similar form in . Since neither  nor its English translation,  is easily accessible, it seemed worthwhile to make these notes available to a wider audience. The notation and terminology follows that of my book, .
Bergman, Clifford, "Notes on Quasivarieties and Maltsev Products" (2018). Mathematics Publications. 216.