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In the present paper, a hardware-software system that may have hardware, software and hardware based software interaction failures is taken. It is considered that a hardware and a software failure occurs purely due to respective hardware and software subsystems whereas a hardware based software interaction failure occurs whenever hardware degradation is not detected or repaired by the software method. It is assumed that, in addition to the software methods, recovery of the hardware and the software subsystems upon their failure may respectively be carried out by external hardware and software engineers.
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