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/****************************************/
#define BTI_MSK(bit) (1 << (bit))
#define BIT_SET(x,bit) ((x) |= BTI_MSK (bit))
#define BIT_CLR(x,bit) ((x) &= ~BTI_MSK (bit))
#define BIT_TST(x,bit) ((x) & BTI_MSK (bit))
/****************************************/
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class ios
{
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