sounds like a college exam to me.. 20g is not much.. Besides, better let people know your thoughts on these questions before someone can answer.. Or we will think you are too lazy to think by yourself , but I know there are some nice people definitely will answer your questions.
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sounds like a college exam to me.. 20g is not much.. Besides, better let people know your thoughts on these questions before someone can answer.. Or we will think you are too lazy to think by yourself 
, but I know there are some nice people definitely will answer your questions.