Does 'The story that it comes from the song  Green Grow the Lilacs,  said to have been sung at San Jacinto, is an example of folk etymology.' exist in a separate context from 'An example of folk etymology is that song', without logical interdependence?
The story that it comes from the song  Green Grow the Lilacs,  said to have been sung at San Jacinto, is an example of folk etymology.###An example of folk etymology is that song