1) Detailed explanation contradicts itself. First bullet states: "When using an index for filtering and sorting the query must include equality conditions on all the prefix keys that precede the sort keys." However, third bullet states: "Yes, while this query fails to use equality on the "address. state" field of the index prefix, it uses the same field for sorting."

2) Detailed explanation contradicts order requirement as described in lessons. Last bullet states: "The order of the fields in the query predicate does not matter." But lessons say that that order does matter.