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sleep <- data.frame(extra = c(0.7, -1.6, -0.2, -1.2, -0.1, 3.4, 3.7,
0.8, 0, 2, 1.9, 0.8, 1.1, 0.1, -0.1, 4.4, 5.5, 1.6, 4.6, 3.4),
    group = gl(2,10),
    ID = factor(rep.int(1:10,2)))