Provided are a computer program product, system, and method for restoring a restore set of files from backup objects stored in sequential backup devices. The liquid crystal lens panel includes a first substrate and a second substrate that face each other; a first electrode layer disposed on the first substrate; a second electrode layer disposed on the second substrate; and a liquid crystal layer interposed between the first substrate and the second substrate. The rule-editing area is configured to accept user input to create or revise the condition of the rule upon user selection of the first element. Thus, the rigidity of the tip end of the rocker arm is enhanced sufficiently.