You are given a sentence and your task is to generate another sentence that supports the given input.

Input: Consider Input: By convention, no subscript is written when a molecule contains only one atom of an element.

Output: If only one atom of a specific type is present a subscript is not used.


Input: Consider Input: Sperm cells are usually motile, having a single flagellum .

Output: In humans, the sperm cell is the only cell with the  flagella structure that enables motility.


Input: Consider Input: An ether is an organic compound having the general structure C-O-C wherein the carbon bonded to the oxygen atom cannot be double bonded to oxygen, sulfur, selenium, or tellurium or triple bonded to nitrogen.


Output: An ether is an organic compound in which two hydrocarbon groups are bonded to the same  oxygen atom.