void internal_set_bit ( REP_SET * set , uint bit ) {
 set -> bits [ bit / WORD_BIT ] |= 1 << ( bit % WORD_BIT ) ;
 return ;
 }
void internal_set_bit ( REP_SET * set , uint bit ) {
 set -> bits [ bit / WORD_BIT ] |= 1 << ( bit % WORD_BIT ) ;
 return ;
 }