OCNT
temp = OCNT(acs);
OCNT(acs) = tocc(ccre - acs);
temp = OCNT(acs);
OCNT(acs) = tocc(ccre - acs);
temp = OCNT(acs);
OCNT(acs) = tocc(ccre - acs);
OCNT(cs) = tocc(ccre - cs); /* offset to next symbol */
temp = OCNT(acs);
OCNT(acs) = tocc(ccre - acs);
OCNT(ccre) = tocc(ccre - acs); /* make a back pointer */
OCNT(ccre) = 0;
temp = OCNT(acs);
OCNT(acs) = tocc(ccre - acs);