Which hazard classes are in the IAAA basic-module set, and which two classes need extra specialised driver modules?

1. Basic covers Classes 1 to 9 inclusive; there are no extra modules
2. Basic covers Classes 2, 3, 4.1, 4.2, 4.3, 5.1, 5.2, 6.1, 6.2, 8 and 9; Class 1 and Class 7 are extra modules
3. Basic covers only Class 3; every other class is a specialised module
4. Basic covers Class 1 and Class 7 only; tanks are included automatically