print (!fileName); print ":";
look(startpos, !linePos, !lineNum);
if startpos=endpos then () else (print "-"; look(endpos, !linePos, !lineNum));
print (!fileName); print ":";
look(startpos, !linePos, !lineNum);
if startpos=endpos then () else (print "-"; look(endpos, !linePos, !lineNum));