Delete duplicate URLs from XML sitemap

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Bids
27
Avg Bid (USD)
$46
Project Budget (USD)
$30 - $50

Project Description:
I have 3 sitemaps, sitemap1.xml, sitemap2.xml, and sitemap3.xml. Each sitemap has 50,000 URLs listed. Take sitemap2.xml and sitemap3.xml and check to see if any of the URLs are already included in sitemap1.xml. If it is already included then delete from sitemap2.xml and sitemap3.xml. Each URL listing will have 4 parts, for example:

loc http://www.example.com/ loc
lastmod 2005-01-01 lastmod
changefreq monthly changefreq
priority 0.8 priority

All 4 parts will need to be deleted if it is a duplicate URL of sitemap1.xml

Skills required:
PHP, Software Architecture, XML
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