ABSENT_STRING
term->strs[ind] = ABSENT_STRING;
ud->str = ABSENT_STRING;
ud->str = ABSENT_STRING;
ud->str = ABSENT_STRING;
#define VALID_STRING(s) ((s) != CANCELLED_STRING && (s) != ABSENT_STRING)
if (ents[i].str == ABSENT_STRING)
ee.str = ABSENT_STRING;
if (t1->strs[i] != ABSENT_STRING ||
t2->strs[i] != ABSENT_STRING)
if (terms[j]->strs[i] == ABSENT_STRING ||
term->strs[i] = ABSENT_STRING;
else if (term->strs[i] == ABSENT_STRING)
ud->str = ABSENT_STRING;