set.seed(67452378)
mom <- create_parent(100, 1:2)
dad <- create_parent(100, 3:4)
kid <- cross(mom, dad)
plot(0,0, type="n", xlim=c(0, 100), ylim=c(0,100),
xaxt="n", yaxt="n", xlab="", ylab="")
loc <- list(c(25,75), c(75,75), c(50,25))
plot_ind(mom, loc[[1]])
plot_ind(dad, loc[[2]])
plot_ind(kid, loc[[3]])
plot_crosslines(loc[[1]], loc[[2]], loc[[3]])
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