A.127.0.0.1/255.0.0.0 B.127.0.0.1/255.255.0.0 C.127.0.0.1/255.255.255.0 D.127.0.0.1/255.255.255.255
A.cd B.ls C.netstat -an D.rm
A.nameserver B.domain C.ns D.search
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