permissions: 0.329
device: 0.221
graphic: 0.199
arm: 0.108
register: 0.107
semantic: 0.097
mistranslation: 0.096
ppc: 0.085
i386: 0.081
TCG: 0.068
risc-v: 0.062
VMM: 0.052
architecture: 0.041
boot: 0.041
PID: 0.037
vnc: 0.034
performance: 0.031
assembly: 0.024
debug: 0.019
files: 0.015
network: 0.011
x86: 0.010
KVM: 0.010
socket: 0.008
hypervisor: 0.008
peripherals: 0.007
kernel: 0.004
user-level: 0.003
virtual: 0.002

Legacy system requirments: iptables