{ TYPE_STRING, &ldi.author, "author" },
{ TYPE_INTEGER, &ldi.levels, "levels" },
{ TYPE_INTEGER, &ldi.first_level, "first_level" },
{ TYPE_STRING, &ldi.author, "author" },
{ TYPE_INTEGER, &ldi.levels, "levels" },
{ TYPE_INTEGER, &ldi.first_level, "first_level" },