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It was comical , really , the way Macnair 's face went from sadistic glee to blank confusion in the blink of an eye . If a TITLE command is given with no text following the title will be set to blank on the plot . These color certificates can be obtained as blanks ; if the purchaser wishes to provide the necessary information , they can be filled in for an additional charge . Questions that produce a negative point biserial have poor testing characteristics and as a simple rule of thumb should be removed from the scoring by clicking them to blank on the Master Answer Key . We also provide paper products and other specialty items such as blank invitations , certificate stock with seals , desktop paper or linen paper , UM-D embossed invitations with matching envelopes and UM-D business cards and letterhead . Abstract System for saving and restoring critical files on the rigid disk of an electrostatographic reproduction machine in the event the disk becomes corrupted wherein the critical files have an identifying header sector transparent to the disk directory , with a floppy disk having a bootable locate and read utility to identify critical files and read them to blank floppy disks so as to enable the rigid disk to be rebuilt or replaced without fear of loss or destruction of the critical files , a disk rebuilding utility to rebuild the rigid disk , and a file restoration utility to restore the critical files to the rigid disk when rebuilding or replacing of the rigid disk is completed .