public void remove(DirectBitMap other) {
        assert wlen == other.wlen;

        int idx = wlen;
        while (--idx >= 0) {
            setWord(idx, word(idx) & (~other.word(idx)));
        }
    }
Remove all elements set in other: this = this AND_NOT other

@param other The other bitset.
indexr-common/src/main/java/io/indexr/util/DirectBitMap.java