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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 backend. You need to configure setProofAPI. Note- withdrawStart transaction must be checkpointed in order to exit the withdraw. 
const erc1155RootToken = posClient.erc1155(<root token address>, true);

const result = await erc1155RootToken.withdrawExitFasterMany(<burn tx hash>);

const txHash = await result.getTransactionHash();

const txReceipt = await result.getReceipt();