combineShared = make([]byte, len(m.mapped))
									combineFilled = make([]byte, len(m.filled))
								}
								for i := range m.filled {
									if m.filled[i] == 1 && combineFilled[i] == 0 {
										combineShared[i] = m.mapped[i]
										combineFilled[i] = 1
									}
								}
								combineFilledBlocks[block] = combineFilled
								combineSharedBlocks[block] = combineShared