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Table 6-5 shows the effective protection provided by the possible combinations of protection attributes . Demmel is concerned by the possible severe , or indeed complete , loss of relative precision associated with the huge numbers that are representable in the sli system . But a note of caution has been raised by a possible link between bone non-union with indomethacin in patients with hip replacement and concomitant long bone fractures [ 12 ] . It is also important to estimate the gamma ray background produced by the possible self-annihilation of dark matter particles .