```
if (requireNamespace("plotly")) {
x <- 1:4
y <- cbind(x, x-3, x-2, x-1, x+1, x+2, x+3)
plot(NA, NA, xlim=c(1,4), ylim=c(-2, 7))
multLines(x, y, col='blue')
multLines(x, y, col='red', pos='right')
}
```

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