problems later problems lead problems leading problems led problems left problems lie problems linked problems listed problems logging problems long problems make problems makes problems making problems may problems may arise problems may occur problems mentioned problems might problems more problems most problems must problems must be solved problems need problems need to be addressed problems never problems not problems now problems occur problems occur when problems occurred problems occurring problems of access problems of children problems of developing problems of development problems of education problems of his own problems of human problems of humanity problems of implementation problems of international problems of interpretation problems of life problems of modern problems of my own problems of nuclear problems of our own problems of our time problems of philosophy problems of poverty problems of public problems of small problems of social problems of the country problems of the past problems of the region problems of the world problems of this kind problems of this world problems of today problems of unemployment problems of urban problems of water problems of women problems of your own problems often problems on their own problems one problems only problems or challenges problems or concerns problems or difficulties problems or issues problems other problems paying problems people problems persist problems persisted problems plague problems plagued problems plaguing problems playing problems please problems posed problems present problems presented problems prevented problems quickly problems raised problems reading problems really problems recently problems regarding problems relate problems related problems relating problems remained problems remembering problems reported