Error:could not find group delete group ID

Dear all

There are some groups in the restart file I want to start another simulation. I need to delete the groups before starting the simulation because the number of groups in a simulation have to be less than 32. However, I can not recognize their ID to delete. I am wondering how I can find the list of all groups in a restart file?

Dear all

There are some groups in the restart file I want to start another
simulation. I need to delete the groups before starting the simulation
because the number of groups in a simulation have to be less than 32.
However, I can not recognize their ID to delete. I am wondering how I can
find the list of all groups in a restart file?

http://lammps.sandia.gov/doc/info.html