self'ing and crossing... in short if you self a plant your inbreeding to the highest level, if your crossing you can be also adding hybrid vigor.
auto x auto is always auto.
auto mazar x auto blue = all auto
auto mazar (plant A) x auto mazar (plant B)= all auto but inbreed.
Auto mazar (plant A) x auto mazar (plant A)= self'ing........... NOW self'ing autos most of the time means pollinating the same plant your also reversing. Because cloning autos for selfing is not easy. So IME breed sisters or strange females when pairing the ladies.