Add more high-density subtrees
It might be worth scanning for epoc32\build\*\udeb and deleting those, as they tend to have a high density
https://developer.symbian.org/oss/API_REF/SHAI/
https://developer.symbian.org/oss/FCL/examples/app/NPR/
https://developer.symbian.org/sfl/API_REF/Public_API/epoc32/
https://developer.symbian.org/oss/FCL/interim/auxiliary_tools/AgileBrowser
https://developer.symbian.org/oss/FCL/interim/auxiliary_tools/route_generator
https://developer.symbian.org/oss/FCL/interim/auxiliary_tools/simulation_PSY
https://developer.symbian.org/sfl/FCL/interim/desktopsw