A temporary and removable car bumper impact absorber protection device with adjustable straps for securing on or inside the trunk of an automobile has a cushioning material resting on and protecting the bumper of the automobile. The frame body has two inclined lower lateral rods at the lower end and two stopping posts at the upper front ends thereof. The computer records the measured data as well as performs computation processing thereof and causes a display unit to display the processing result as an effective management parameter of the liquid helium. The tethers may include a strength limit to prevent an excessive amount of force from being applied that could damage the vertebral members. The gate region abuts a channel region of the conducting region. Thus, based on the lemmas, optimizations across hierarchical boundaries can be performed, while the hierarchical structure of the design is preserved so that equivalence checking of hierarchical circuit designs can still be based on the equivalence of individual hierarchical blocks.