knitr::opts_chunk$set(echo = FALSE, fig.align = 'center') library(knitr)
background-image: linear-gradient(to bottom, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0.8) 100%), url(https://liao961120.github.io/slides/img/pictures/cabin.jpg) background-position: center background-size: cover
.l[ - https://liao961120.github.io
]
.footnote[
]
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