Share via Share via... Twitter LinkedIn Facebook Pinterest Telegram WhatsApp Yammer Reddit TeamsRecent ChangesSend via e-MailPrintPermalink × This is an old revision of the document! PHP's gd library is missing or unable to create PNG images Dr. Fill Crosswords and An Implemented Solver for Singly Weighted CSPs Dr. Fill Crosswords and An Implemented Solver for Singly Weighted CSPs