}
unsigned int
-interaction_case_hash (const struct interaction *iact, const struct ccase *c)
+interaction_case_hash (const struct interaction *iact, const struct ccase *c, unsigned int base)
{
int i;
- size_t hash = 0;
+ size_t hash = base;
for (i = 0; i < iact->n_vars; ++i)
{
const struct variable *var = iact->vars[i];