## ----options, include=F, cache=F, results='hide', message=F----------------
knitr::opts_chunk$set(fig.align="center", cache=FALSE,error=FALSE,
fig.width=6,fig.height=6,autodep=TRUE,
out.width="600px", out.height="600px",
results="markup", echo=TRUE, eval=TRUE)
options(getClass.msg=FALSE)
set.seed(6473) ## for reproducibility
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