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Convert NEWS.md to ASCII NEWS for R packages
# 1.'-e' part: Replaces all level 2 headers and appends a ":" at the end of the line
# 2.'-e' part: Indents all bullet points with a whitespace
# 3.'-e' part: Removes all level 2 headers
# 4.'-e' part: For all level 1 headers, add linebreak and 80 hyphens (not strictly required but clean)
# 5.'-e' part: Remove all level 1 headers
sed -e '/^##/ s/$/:/' -e 's/^*/ */' -e 's/^## *//' -e "/^#/a\\--------------------------------------------------------------------------------" -e 's/^# *//' < NEWS.md > NEWS
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