Which dwarf regular cross combination poly hybrids necessary?

Which cross I have a single seed just want genetic preservation variety .
flash
bubble crack
lemon haze
Diesel haze

short stuff
Russian rocket fuel
auto#1
blue Himalaya
snowryder

sensi
ruderalis indica
ruderalis skunk

freedom of seeds
guerilla ryder
Crystal dwarf
a little kushy auto

so you have one ,you want to breed but you have to cross it with one? what strain is the single one?
or out of all those listed , which should you cross?