My os was uninstalled, formatted the internal storage of my Nexus 4. How can I install a new Android os?

[AC Question]

my os was uninstalled ,formated the internal storage of my nexus 4.how can i install new android os.

i formated the internal storage of my nexus 4.In recovery mode its showing no os is installed.i need to install android os in that phone.will u guys help me to find solution to this problem.In my system only 44mb was occupied all the other were wiped.help to install new android os nd i am using twrp recovery mode.