#1ㅡ nova system .ni ₍ᐢ.ˬ.⑅ᐢ₎834213200book one of intros ;pnovasystem #2ㅡ nova subsystems .ni ₍ᐢ.ˬ.⑅ᐢ₎2343840intros ;pnovasystem #3ㅡ nova subgroups .ni ₍ᐢ.ˬ.⑅ᐢ₎1233941intros ;pnovasystem