A wheeled dolly or support for a ladder is made in two pieces, including a base plate that permanently affixes to an outside surface of a rail of a ladder, and a frame that is removably mounted on the base plate. Embodiments of the present disclosure provide a strong FEC algorithm that performs similarly to RS when a simple decoder is used, and scales up linearly to a full-scale decoder that outperforms all 7% algorithms currently in G. The binder contains a polyimide resin represented by the following chemical formula :where R contains at least a benzene ring, and n is within the range of from 10 to 100,000, and the negative electrode active material particles have an average particle size of 5 \u03bcm or greater.