There are provided a polymer compound which can form a resist pattern with excellent resolution, and a negative resist composition containing the polymer compound and a resist pattern-forming method thereof. A rigid polystyrene insulation member is placed in the interior space and bonded to the expanding foam material. One of the segments comprises a vacuum-insulated double-walled female portion and the other segment comprises a vacuum-insulated double-walled male portion engaged at least in part in the female portion. When such angular or curvature discontinuities occur, the computer determines sequential instructions, so that the round axle begins to start accelerating before the angle or curvature discontinuities occurs, and the acceleration of the round axle terminates only after the angle or curvature discontinuity has ended. The string latch assembly has an anti-dryfire lever that is only moved from the blocking position when an arrow is nocked.