Obstacles can be unbridgeable.Logical formLearned from11 sentences. Obstacles can be to building (spy satellites).Logical formLearned from11 sentences. An obstacle can be to an aim.Logical formLearned from11 sentences. A question can be an obstacle.Logical formLearned from11 sentences. Criminal activities can be an obstacle to peace.Logical formLearned from11 sentences. Others may face obstacles.Logical formLearned from11 sentences. An obstacle can be to a growth.Logical formLearned from11 sentences. Obstacles can be to cooperation.Logical formLearned from11 sentences. An obstacle can be to democratic reform.Logical formLearned from11 sentences. An obstacle can be to (peace negotiations).Logical formLearned from11 sentences. A failure may constitute an obstacle to achieving a dream of statehood.Logical formLearned from11 sentences. An obstacle can be to achieving a dream of statehood.Logical formLearned from11 sentences. An obstacle can be to a journey.Logical formLearned from11 sentences. An obstacle may be removed.Logical formLearned from11 sentences. Persons may create obstacles.Logical formLearned from11 sentences.