Labels:bulletin board | daybook | monitor | paper | reckoner | screen | sky OCR: TMPLEMENTATION LEVEL ALGORITHM CHECK THAT INPUT DESCRIBES VALD GRAPM CHELK 3OON LIST SCAN FOLLOWED BY ALL NO OES NO REPEATS MARK FIRST NODE PLAE UN DER THE FIeST NODE NODE LIST SCAN THE NODE LS17 FINO NODE TMAT NOT MAeKED FOLLOWEN DIGlT NODES DIFFERENT EnGE PLACE LIS7