. . "PDF file" . . "PDF" . . . . . . . . "ISO 32000-1:2008" . . "Adobe PDF" . . . . . . . . . . . . . . . ".pdf" . "electronic" . . . . . . "PDFs" . . . "PDF#Forms" . . "PDF" . . "PDF#Viewers_and_editors" . . . . . . . . . . . . . . . . "PDF#Standard Type 1 Fonts (Standard 14 Fonts)" . "PDF files" . . . . . "PDF and ISO 32000-1" . "Portable Document Format" . . . . . . "PDF#Annotation" . . . . . . . . ".PDF file" . "pdfs" . . . "PDF#Interactive elements" . . "PDF documents" . . . . . . . . . . . . . . "PDF (vector graphics)" . . . . . . . . . . . . "documents" . . "PDF#File structure" . . . . . . . . . . "Portable Document Format (PDF)" . . . . . . . . . . "portable document format (PDF)" . "PDF#Software" . . . "PDF Secure" . . . "PDF specification" . . . . . . "pdf" . . . ".PDF" . "PDF#Forms Data Format (FDF)" . "Acrobat Reader" . . . . . . "PDF format" . . . . . . "PDF (portable document format)" . . . . . . . . . . . . . . . .