TASK DEFINITION: You are given two sentences. You have to find if there is entailment or agreement of the Hypothesis by the Premise. From the given pair of sentences, you should identify if there is enough information in the Premise to support the claim made in the Hypothesis. The Premise may not exactly be the same as Hypothesis. Your task is to return 'entails' if the premise supports hypothesis else return 'neutral'.
PROBLEM: Premise: Cigarette smoke contains may carcinogens (cancer-causing chemicals) and is one of the major causes of illness and death in the world. 
 Hypothesis: Cigarettes are a major source of carcinogens, a kind of chemical substances linked with cancer.

SOLUTION: entails

PROBLEM: Premise: Some of these isotopes have half-lives of tens of thousands of years, and therefore require long-term isolation. 
 Hypothesis: The long-lived isotopes require thousands of years to decay to a safe level in a nuclear reactor.

SOLUTION: entails

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

SOLUTION:
entails