source: [tag=NNS] [tag=TO] [word=global] [lemma=□]
destination: [tag=NNS] [tag=TO] [word=global] [lemma=problem]
spec: Various certification path types can be implemented by subclassing the CertPath class , even though they may have different contents and ordering schemes . If true value continues to be placed on finding global solutions to global problems , a strengthened UN is essential .