df1 <- iris[1:5, 3:5]
df2 <- iris[100:105, 3:5]
stack_table(df1, df2)
# ```````````````````````````````````````````
# ` Petal.Length Petal.Width Species
# ` 1: 1.4 0.2 setosa
# ` 2: 1.4 0.2 setosa
# ` 3: 1.3 0.2 setosa
# ` 4: 1.5 0.2 setosa
# ` 5: 1.4 0.2 setosa
# ` ______________________________________
# ` Petal.Length Petal.Width Species
# ` 1: 4.1 1.3 versicolor
# ` 2: 6.0 2.5 virginica
# ` 3: 5.1 1.9 virginica
# ` 4: 5.9 2.1 virginica
# ` 5: 5.6 1.8 virginica
# ` 6: 5.8 2.2 virginica
# `
# ```````````````````````````````````````````
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