WITNESS_RELATED_MASK
#define WITNESS_DTOA(x) (((x) & WITNESS_RELATED_MASK) >> 2)
r1 = w_rmatrix[i1][i2] & WITNESS_RELATED_MASK;
r2 = w_rmatrix[i2][i1] & WITNESS_RELATED_MASK;
#define WITNESS_ATOD(x) (((x) & WITNESS_RELATED_MASK) << 2)