As such we can say that a square is a  type of rectangle which is a type of shape. We can therefore pass a  square into any function that expects a shape or rectangle object  because a square is covariant with both a rectangle and a shape.
Format: Audio CD. The song Rule the World was featured in the motion picture Stardust which was released in the US this year. Although little known in the US, Take That is a top act in Europe and thing song has hit the top 10 list in the UK immediately after its release.
What is the most known song in the whole world? Say, a song that anybody from New York City to the native tribes in Indonesia can sing the lyrics or hum the music to, even when they don't know the title or singer. My answer: Some of them are: We are the World by Michael Jackson and Lionel Richie. Blowing in the Wind by Bob Dylan.