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This dataset gives an example of a truly two-dimensional voting system 
twodim_voting <- data.frame(
    row.names = c("A", "B", "C", "D", "E", "F", "G"),
    I1 = c(1, 1, 0, 0, 0, 0, 0),
    I2 = c(1, 1, 1, 0, 0, 0, 0),
    I3 = c(0, 0, 1, 1, 0, 0, 1),
    I4 = c(0, 1, 1, 1, 0, 0, 1),
    I5 = c(1, 1, 1, 1, 0, 0, 0)
) 
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