all: introduction_to_markdown.html NLINES=10000000 %.html: %.org emacs -batch $^ --funcall org-html-export-to-html sed -i -e 's/

//g' \
	       -e 's///g' $@
	mv $@ $@.bak
	cat $@.bak | grep -A $(NLINES) -e '' | grep -B $(NLINES) -e '' | grep -v -e '' -e '' > $@
	rm $@.bak