Step 1. Ask

Step 2. Prepare

Step 3. Process

Use BigQuery to deal with these files. And use spreadsheet to analyze it.

Step 4. Analyze and share

Here is the link of my data analysis:https://docs.google.com/spreadsheets/d/1yOScd65EO1bLq3Y8JRujuAM2jEdPgh3oFS3ELGezcUM/edit?usp=sharing

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