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Creating repeatative objects :

> rep(3,6)                    # [repeats 3 six times]
[1] 3 3 3 3 3 3
> rep(1:3,4:6)
 [1] 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3
> rep(c(1,3,2),length=20)
 [1] 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3

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