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import 'alltypes.proto'; extend AllTypes { optional int32 AllTypes_extensionfield1 = 255; } message ExtensionMessage { extend AllTypes { optional ExtensionMessage AllTypes_extensionfield2 = 254; required ExtensionMessage AllTypes_extensionfield3 = 253; repeated ExtensionMessage AllTypes_extensionfield4 = 252; } required string test1 = 1; required int32 test2 = 2; }