Initialise a bit set capable of holding ni integers, 0 <= i < ni. The set returned is empty if fill == 0, or all of [0,ni) otherwise. bn is always non-zero (a fact used by kbs_next()).
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Initialise a bit set capable of holding ni integers, 0 <= i < ni. The set returned is empty if fill == 0, or all of [0,ni) otherwise. bn is always non-zero (a fact used by kbs_next()).