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userContractVersionMap = userAllContract.stream().collect(Collectors.groupingBy(SysUserContracts::getUserId, Collectors.mapping(SysUserContracts::getVersion, Collectors.toSet())));
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userContractVersionMap = userAllContract.stream().collect(Collectors.groupingBy(SysUserContracts::getUserId, Collectors.mapping(SysUserContracts::getVersion, Collectors.toSet())));
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