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title: 1. for a specific transaction, user initialized note: ``` pub struct GasLessTransactionData { pub kind: TransactionKind, sender: SuiAddress, } ``` User -> Sponsor: gas request with ** gas-less TransactionData** Sponsor -> Sponsor: check tx, select gas, construct TransactionData with the gas, and sign TransactionData Sponsor -> User: TransactionData, sponsor sig User -> User: check gas, gas sig, sign TransactionData User -> FullNode: submit dual signed transaction