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Reason for failure:

EJB Exception: ; nested exception is: org.ieee.xplore.exception.SearchDaoException: Navigation Engine not able to process request 'http://endecaprod.ieee.org:80/graph?node=4288439491+4287953662&allgroups=1&offset=0&nbins=25&filter=AND%28OR%283406%2c3408%29%2cNOT%284292746436%29%29&irversion=614'. Query is refinements=4288439491,4287953662&openedRefinements=*&matchBoolean=true&searchField=Search All; nested exception is: org.ieee.xplore.exception.SearchDaoException: Navigation Engine not able to process request 'http://endecaprod.ieee.org:80/graph?node=4288439491+4287953662&allgroups=1&offset=0&nbins=25&filter=AND%28OR%283406%2c3408%29%2cNOT%284292746436%29%29&irversion=614'. Query is refinements=4288439491,4287953662&openedRefinements=*&matchBoolean=true&searchField=Search All