BZ_RUNB
mtfv[wr] = BZ_RUNB; wr++;
s->mtfFreq[BZ_RUNB]++;
mtfv[wr] = BZ_RUNB; wr++;
s->mtfFreq[BZ_RUNB]++;
if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) {
if (nextSym == BZ_RUNB) es = es + (1+1) * N;
while (nextSym == BZ_RUNA || nextSym == BZ_RUNB);