[lemma=certainly] [lemma=true] [tag=IN] □
[lemma=certainly] [lemma=true] [tag=IN] [□]
[lemma=certainly] [lemma=true] [tag=IN] □*
It is certainly true that the United States can hardly escape involvement abroad . Nonetheless , some useful further work has been done and it is also certainly true that the main outstanding issues on which decisions are urgently needed have been more clearly identified . It is certainly true that the designer of a DTD for mathematics faces a fearsome champ de bataille and clearly needs a stout heart . Although it remains an open question which of the two types of pioneer settlement will be more successful in the long run , it is certainly true that the strategies of spontaneous pioneers may well provide a variety of useful hints to regional planners and policy makers for the implementation of their settlement projects .