Definition: From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
Input: Given Relationship: 'require', Sentence: 'Microsoft Internet Explorer 4.0 or higher and Netscape Navigator TM4.0 or higher is recommended , and Adobe Acrobat Reader 3.0 or higher is required to browse the PDF files .'
Output:
required