Write-ahead log replay

Recover a key-value store by replaying a write-ahead log, then answer point lookups. The log is a list of records applied in order: ['set', key, value] writes/overwrites a key, ['del', key] removes a key (no-op if absent). After replaying the whole log, answer the given lookup keys, returning each key's value or the string 'ABSENT' if it is not present in the recovered state. Keys and values are strings. Return a list of values, one per lookup, in order.