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"presidents" <-structure(c(NA, 87, 82, 75, 63, 50, 43, 32, 35, 60, 54, 55, 36, 39, NA,NA, 69, 57, 57, 51, 45, 37, 46, 39, 36, 24, 32, 23, 25, 32, NA, 32, 59,74, 75, 60, 71, 61, 71, 57, 71, 68, 79, 73, 76, 71, 67, 75, 79, 62, 63,57, 60, 49, 48, 52, 57, 62, 61, 66, 71, 62, 61, 57, 72, 83, 71, 78, 79,71, 62, 74, 76, 64, 62, 57, 80, 73, 69, 69, 71, 64, 69, 62, 63, 46, 56,44, 44, 52, 38, 46, 36, 49, 35, 44, 59, 65, 65, 56, 66, 53, 61, 52, 51,48, 54, 49, 49, 61, NA, NA, 68, 44, 40, 27, 28, 25, 24, 24),.Tsp = c(1945, 1974.75, 4), class = "ts")