The official report offered no explanations for the many mysteries encountered by the investigators; however, the experts did convince themselves that they understood one basic principle of Raman engineering. Since most of the major systems and subsystems encountered inside Rama by the human explorers had two functional backups, it appeared that the aliens engineered everything in threes. Therefore, since the entire giant vehicle was assumed to be a machine, it was considered highly likely that two more Rama spacecraft would be following the first visitor.
