tests unique_everseen with non-adjacent duplicates
tests unique_everseen with non-adjacent duplicates

tempbottle/cppitertools,ryanhaining/cppitertools,tempbottle/cppitertools,tempbottle/cppitertools,ryanhaining/cppitertools,jkhoogland/cppitertools,jkhoogland/cppitertools,jkhoogland/cppitertools,ryanhaining/cppitertools