import numpy as np
import pandas as pd
# Example 1 - concatenate two dataframes
data1 = {"ID" : ["2134", "4524"],
"name" : ["John Smith", "Jane Doe"]}
df1 = pd.DataFrame(data1)
data2 = {"ID" : ["9423", "3483"],
"name" : ["Bob Jones", "Mary Smith"]}
df2 = pd.DataFrame(data2)
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