ccx support in a standalone python script

[sunnsi]

#!python
import sys
sys.path.append('E:/Coreform Cubit 2025.1/bin')
sys.path.append('E:/Coreform Cubit 2025.1/build_windows_2025.5')
import cubit
cubit.init(['--no-gui', '--no-graphics'])
cubit.cmd('set undo on')
cubit.cmd('undo on')
cubit.cmd('import step "D:/Nextcloud/Teaching/FEM/Calculix/PrePoMax examples geometries/Example 3 - elliptical bar.stp" heal')
cubit.cmd('set duplicate block elements off')
cubit.cmd('undo group begin')
cubit.cmd('block 1 add volume 1 ')
cubit.cmd('undo group end')
cubit.cmd('ccx block 1 element_type C3D20R')
...

Error:

ERROR: Unrecognized Keyword: 'ccx'
ERROR: syntax error