What is the difference between M1 and M2

I was wondering if someone could explain how to solve a hw problem I was confused on. It was the one where it says: What is the difference between M1 and M2? and gave a chart of the following information: currency 0 billion, check-able deposits 0 billion, travelers checks billion, small-denomination time deposits $700 billion, saving deposits billion, money market mutual funds $500 billion, other liquid assets 0 billion, denomination time deposits $200 Billion

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