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<?php
 class TestClass3
 {
 function __construct(TestClass $Tests) {
 $this->Tests = $Tests;
 }
 
 function out()
 {
 return 'from TestClass3 calling TestClass '. $this->Tests->out();
 }
 }
 
 class TestClass {
 function out()
 {
 return 'I am from TestClass';
 }
 }
 
 class TestClass5 {
 function out()
 {
 return 'I am from TestClass5';
 }
 }
 
 class TestClass4
 {
 function __construct(TestClass $Tests, TestClass2 $Testss) {
 $this->Tests = $Tests;
 $this->Testss = $Testss;
 }
 
 function out()
 {
 return $this->Tests->out() .' and from TestClass2 '. $this->Testss->out();
 }
 }
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