feat(Go-StudyExample): 添加CloneExample,测试go语言的对象内存和深度克隆的实现关于对象克隆可参考文章[知乎-](https://zhuanlan.zhihu.com/p/59125443)、[知乎-](https://zhuanlan.zhihu.com/p/58065429)
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@@ -19,4 +19,7 @@ func main() {
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//--------------------------测试json包的转换功能
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example.JsonMarshalTest()
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example.JsonUnmarshalTest()
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example.TestClone()
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}
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@@ -0,0 +1,20 @@
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/*
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* @Author : huangzj
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* @Time : 2020/5/15 9:54
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* @Description:
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*/
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package entity
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type SynthesisRuleCmp struct {
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*SynthesisRule
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RemainingSynthesisTime int
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Sort int
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}
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type SynthesisRule struct {
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SynthesisId string `json:"SynthesisId"`
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SynthesisNum int `json:"SynthesisNum"`
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CostItems [][]int `json:"CostItems"`
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SynthesisItems [][]int `json:"SynthesisItems"`
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}
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@@ -0,0 +1,147 @@
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/*
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* @Author : huangzj
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* @Time : 2020/5/13 17:52
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* @Description:测试深拷贝和浅拷贝的代码类
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*/
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package example
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import (
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"Go-StudyExample/entity"
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"Go-StudyExample/util"
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"fmt"
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)
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func TestClone() {
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fmt.Print("\n\n\n")
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fmt.Print(" Go语言深克隆的测试:\n\n")
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testJustBasicType()
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testHasPointType()
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fmt.Println("由此可见其实Go语言对于内存的分配,相对对象是独一份,对于对象的基本类型和值类型(结构体),应该是在其内部开辟了内存空间进行存储,而对于" +
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"指针类型来说,直接使用它的地址(指针),不对结构体进行复制")
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fmt.Println("")
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testDeepCloneByEncode()
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testDeepCloneByJsonPackage()
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}
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func testDeepCloneByJsonPackage() {
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rule := entity.SynthesisRule{
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SynthesisId: "112",
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SynthesisNum: 0,
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CostItems: nil,
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SynthesisItems: nil,
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}
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//这边必须是指定的类型,不然没办法转回去
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rule1, err := util.DeepCopyByJson(rule)
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if err == nil && rule1 != &rule {
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fmt.Println("")
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fmt.Println("通过json包的方式可以实现深度克隆")
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}
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}
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func testDeepCloneByEncode() {
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rule := entity.SynthesisRule{
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SynthesisId: "112",
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SynthesisNum: 0,
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CostItems: nil,
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SynthesisItems: nil,
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}
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rule1 := new(entity.SynthesisRule)
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err := util.DeepCopyByGob(rule1, rule)
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if err != nil {
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panic(err)
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}
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rule1.SynthesisId = "123"
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if rule1 != &rule {
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fmt.Println("通过序列化的方式可以实现深度克隆")
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}
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}
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func testJustBasicType() {
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rule := entity.SynthesisRule{
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SynthesisId: "112",
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SynthesisNum: 0,
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CostItems: nil,
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SynthesisItems: nil,
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}
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rule1 := rule
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rule.SynthesisId = "222"
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rule.SynthesisItems = make([][]int, 0)
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rule.SynthesisItems = append(rule.SynthesisItems, []int{1})
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if &rule1 != &rule {
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fmt.Println("结构体中不存在指针,直接用 = 是")
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fmt.Println("深克隆")
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fmt.Println("")
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}
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}
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func testHasPointType() {
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cmp := entity.SynthesisRuleCmp{
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SynthesisRule: &entity.SynthesisRule{
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SynthesisId: "112",
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SynthesisNum: 0,
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CostItems: nil,
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SynthesisItems: nil,
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},
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RemainingSynthesisTime: 0,
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Sort: 0,
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}
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cmp1 := cmp
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cmp.SynthesisId = "123"
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if &cmp != &cmp1 && cmp.SynthesisRule == cmp1.SynthesisRule {
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fmt.Println("结构体中存在指针,直接用 = 是深克隆")
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fmt.Println("但是对于结构体中的指针来说是浅克隆,直接使用地址")
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fmt.Println("")
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}
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}
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func testHasPointTypeList() {
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cmp := entity.SynthesisRuleCmp{
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SynthesisRule: &entity.SynthesisRule{
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SynthesisId: "112",
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SynthesisNum: 0,
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CostItems: nil,
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SynthesisItems: nil,
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},
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RemainingSynthesisTime: 0,
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Sort: 0,
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}
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cmp1 := entity.SynthesisRuleCmp{
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SynthesisRule: &entity.SynthesisRule{
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SynthesisId: "112111",
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SynthesisNum: 0,
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CostItems: nil,
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SynthesisItems: nil,
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},
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RemainingSynthesisTime: 0,
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Sort: 0,
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}
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list := make([]entity.SynthesisRuleCmp, 0)
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list = append(list, cmp1)
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list = append(list, cmp)
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list1 := make([]entity.SynthesisRuleCmp, len(list))
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cmp.RemainingSynthesisTime = 1000
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fmt.Println(cmp1.RemainingSynthesisTime)
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copy(list1, list)
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list1[0].SynthesisId = "12333"
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if list[0].SynthesisId == list1[0].SynthesisId {
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fmt.Println("非深度克隆")
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}
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list2 := list[0:]
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list2[0].SynthesisId = "54323"
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if list[0].SynthesisId == list2[0].SynthesisId {
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fmt.Println("非深度克隆")
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}
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}
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@@ -3,3 +3,6 @@
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2020/4/27 :创建项目,添加使用示例如下:
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map与struct之间转换的处理工具使用示例,参考代码地址:https://github.com/mitchellh/mapstructure
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json与struct之间转换处理工具使用示例
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2020/5/15 : 添加CloneExample,测试go语言的对象内存和深度克隆的实现关于对象克隆可参考文章[知乎-](https://zhuanlan.zhihu.com/p/59125443)、[知乎-](https://zhuanlan.zhihu.com/p/58065429)
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@@ -0,0 +1,39 @@
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/*
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* @Author : huangzj
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* @Time : 2020/5/14 17:53
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* @Description:
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*/
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package util
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import (
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"Go-StudyExample/entity"
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"bytes"
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"encoding/gob"
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"encoding/json"
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)
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/*
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* @param dst 目标对象
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* @param src 源对象
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* 通过序列化的方式进行克隆
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*/
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func DeepCopyByGob(dst, src interface{}) error {
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var buffer bytes.Buffer
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if err := gob.NewEncoder(&buffer).Encode(src); err != nil {
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return err
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}
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return gob.NewDecoder(&buffer).Decode(dst)
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}
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func DeepCopyByJson(src interface{}) (*entity.SynthesisRule, error) {
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var dst = new(entity.SynthesisRule)
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b, err := json.Marshal(src)
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if err != nil {
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return nil, err
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}
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err = json.Unmarshal(b, dst)
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return dst, err
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}
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