*/
int leaf_ambiguity(int rid){
  int rc;             /* Result */
  char zVal[30];
  if( !is_a_leaf(rid) ) return 0;
  sqlite3_snprintf(sizeof(zVal), zVal, "%d", rid);
  rc = db_exists(
       "SELECT 1 FROM leaf" 
       " WHERE NOT %z"
       "   AND rid<>%d"
       "   AND (SELECT value FROM tagxref WHERE tagid=%d AND rid=leaf.rid)="
       "       (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d)"
       "   AND NOT %z",
       leaf_is_closed_sql(zVal), rid, TAG_BRANCH, TAG_BRANCH, rid,
       leaf_is_closed_sql("leaf.rid"));