A nuclear power plant uses 4 cooling lines to carry away heat from the central core reactor. Lines A1 and A2 cool the top and bottom surfaces while lines B1 and B2 cool the top and bottom halves of the cylindrical chamber. The reactor will not overheat if any one B lines is functioning (i.e. both A and the other B line is down) or if both A lines function (i.e. both B lines can be down). If the reliability of each line is 0.9, what is the overall system reliability?

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A2 A, B, B2 A1 Ві B2 A2