"7th Ed. UNIX" . "Version 7 Unix" . "Edition 7" . . . "UNIX V7" . "V7" . . . "V7 Unix" . "UNIX Time-Sharing System v7" . . . . . "V7 UNIX" . . "UNIX v7" . "Version 7" . "Seventh" . "Version 7 Unix" . "Unix Version 7" . . . "Unix 7th Edition" . "UNIX Version 7" . . "Unix V7" . "Version 7 Unix File System" . . . "Unix v7" . "Version 7 Unix" . . . "Seventh Edition Unix" . "7th Edition" . "Edition 7 Unix" . "Version 7 UNIX" . .