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The withdrawExitFasterMany method can be used to exit the withdraw process by using the txHash from withdrawStartMany method. It is fast because it generates proof in the back-end. You need to configure setProofAPI. Note- withdrawStart transaction must be checkpointed in order to exit the withdraw. 
const erc721RootToken = posClient.erc721(<root token address>, true);

const result = await erc721RootToken.withdrawExitFasterMany(<burn tx hash>);

const txHash = await result.getTransactionHash();

const txReceipt = await result.getReceipt();