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These "fixed location" objects can be found in multiple ways: 1. The lookup parameters use the same format as other ledger objects, but the only valid value is true or the valid index of the object: - Amendments: "amendments" : true - FeeSettings: "fee" : true - NegativeUNL: "nunl" : true - LedgerHashes: "hashes" : true (For the "short" list. See below.) 2. With RPC API >= 3, using special case values to "index", such as "index" : "amendments". Uses the same names as above. Note that for "hashes", this option will only return the recent ledger hashes / "short" skip list. 3. LedgerHashes has two types: "short", which stores recent ledger hashes, and "long", which stores the flag ledger hashes for a particular ledger range. - To find a "long" LedgerHashes object, request '"hashes" : <ledger sequence>'. <ledger sequence> must be a number that evaluates to an unsigned integer. - To find the "short" LedgerHashes object, request "hashes": true as with the other fixed objects. The following queries are all functionally equivalent: - "amendments" : true - "index" : "amendments" (API >=3 only) - "amendments" : "7DB0788C020F02780A673DC74757F23823FA3014C1866E72CC4CD8B226CD6EF4" - "index" : "7DB0788C020F02780A673DC74757F23823FA3014C1866E72CC4CD8B226CD6EF4" Finally, whether the object is found or not, if a valid index is computed, that index will be returned. This can be used to confirm the query was valid, or to save the index for future use.