# NOT RUN {
library(dplyr)
x1 <- data.frame(id = 1:4, bla=letters[1:4],
chromosome = c("chr1", "chr1", "chr2", "chr1"),
start = c(100, 200, 300, 400),
end = c(150, 250, 350, 450))
genome_complement(x1, by=c("chromosome", "start", "end"))
# }
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