tokens: ['', 'A', 'VM', 'service', 'request', 'failure', 'occurs', '', 'VNF', 'application', 'determines', 'that', 'the', 'VM', 'service', 'request', 'failure', 'is', 'not', 'caused', 'by', 'the', 'VNF', 'application', 'programming', 'logic', 'a', 'Sends', 'the', 'alarm', 'indicating', 'VM', 'service', 'request', 'failure', 'to', 'EM', 'or', 'b', 'If', 'the', 'VM', 'service', 'request', 'failure', 'causes', 'a', 'VNF', 'application', 'failure', 'sends', 'an', 'alarm', 'indicating', 'VNF', 'application', 'failure', 'with', 'probable', 'cause', 'indicating', 'VM', 'service', 'request', 'failure', 'to', 'EM', '', 'EM', 'forwards', 'alarm', 'information', 'to', 'NMOSS', 'according', 'to', 'step', '', 'of', 'clause', 'B', 'of', '', '', 'EM', 'can', 'trigger', 'a', 'corrective', 'action', 'request', 'towards', 'VNFM', 'according', 'to', 'step', '', 'of', 'clause', 'B', 'of', '']