names(x) <- cities labels each value.

Goal

Print Nairobi units by name.

units <- c(12, 8, 5)
names(units) <- c("Nairobi", "Mombasa", "Kisumu")
print(units["Nairobi"])
print(names(units))

mm <- c(Nairobi = 85, Kisumu = 120)
print(mm["Kisumu"])

x <- 1:3
names(x) <- c("a", "b", "c")
print(x["b"])

units <- c(Nakuru = 4, Eldoret = 3)
print(sum(units))