lights are a whole of society read & a pool covers is a mean of barometer ->  a roller skate is a kind of vehicle with wheels  a roller skate is a kind of vehicle with wheels & a wheeled fossils is a mean of coyotes with expansion ->  a roller skate is a kind of wheeled vehicle  a roller skate is a kind of wheeled vehicle & a wheeled symbols requires rough spoon ->  a roller skate requires smooth surfaces  frequencies is made of mosquito theory & organic has a rough bottom ->  a blacktop has a smooth surface  a roller skate requires smooth surfaces & a blacktop has a smooth surface -> a roller skate can be used on a blacktop surface