Read the given query and classify it as a 'Good' or 'Bad' query depending on how well the query is formed, 'Bad' being the expected output for a not so well formed query and 'Good' being the expected output for a well formed query. A query may be wrong based on common sense or general facts, but if it is well formed, you should answer with Good.

Example Input: Propane Tanks Weights ?
Example Output: Bad

Example Input: Why does differential enthalpy control provide greater energy savings than single enthalpy control ?
Example Output: Good

Example Input: What is communicative purpose ?
Example Output:
Good