How many types of size categories and data classes are there? | SAP ABAP

There are five size categories (0-4) and 11 data classes only three of which are appropriate for application tables:
APPL0- Master data (data frequently accessed but rarely updated).
APPL1- Transaction data (data that is changed frequently).
APPL2- Organizational data (customizing data that is entered when system is configured and then rarely changed).
The other two types are:
USR
USR1 - Intended for customer's own developments.