yes you can have all the genes in one snake. the quickest way to get 4 in a snake....
breed 2 morphs together, you make double hets
also breed the other 2 morphs. you make double hets of them.
breed the double hets from one pair of morphs and hit the 1/16 odds of a double recessive, then do the same for the other pair of morphs and also hit the 1/16 odds.
then breed the two double recessive together. making quad hets.
breed the quad hets together and hit the 1/256 odds and theres your 4 recessive in one snake.
It is But that looooong Shot...
For example Axanthic Clown Pied That will require breed for(fastest way as of now) Axanthic Clown(very expansive animal) to Axanthic Pied (another very expansive animal)...
You will get All Axanthic babies double hets for Clown and Pied.
Then you breed babies together... and have If I good remember 12.5% chance for Axanthic Clown Pied.. Is a lot of work... few years project but is possible..
1.0 Striped African House Snake "Marduk"
0.1 Striped African House Snake Ishtar
1.0 black phase Brown House Snake Seth
0.1 black phase Brown House Snake Nephthys
I don't think there is a limit but the odds of mutiple recessives start getting real low. Also depending on the traits it may be hard to distinguish them all but it's still possible.