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    <subfield code="a">agile methods</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">eXtreme Programming</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">XP</subfield>
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    <subfield code="a">security assurance</subfield>
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    <subfield code="a">engineering secure software</subfield>
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