\[\begin{array}{ll} \begin{array}{l} {}_{-\!}4780 \\ \,\,\,\underline{\square}\,\,\,\,\, \end{array} & \left| \begin{array}{l} \underline{900} \\ \square. \end{array} \right. \\ \,\,\,\,\,\,\square \end{array}\]