Separate read and write ports in a memory system allow simultaneous access to a memory cell array by read and write operations. In the method, a plurality of sample polynucleotide fragments are used to form a mixture of different-length sequencing fragments. The shaft support portion is provided at a flat plate portion of the paper support. One embodiment creates a root issue object for each change request object and allows a user to partition an issue object into issue sub-objects. A portion of the body is removable to provide easy access to the light bulb for removal and changing when required.