The number of fusible links and other circuit components required to provide memory cell redundancy are reduced by sharing physical memory locations among address banks that store memory addresses. The first semiconductor optical device includes a first core layer and a first clad layer which is formed over the first core layer and which has a crystal surface on a side on a second semiconductor optical device side that forms an angle \u03b8 greater than or equal to 55 degrees and less than or equal to 90 degrees with the plane. The first set of packets and the second set of packets are maintained as separate streams at the hardware protocol analyzer. Distinctly shaped solid chemical feed units are disclosed. The first common telephone number is selected such that it is unique and is adapted to be shared among a group of users in the first home telephone network. The bi-layer capping protects the layer to be transferred from possible degradation resulting from the attachment and removal processes of the carrier assembly used for layer transfer.