## lesson-check-all : validate lesson Markdown, checking line lengths and trailing whitespace.
lesson-check-all :
- @bin/lesson_check.py -s . -p ${PARSER} -l -w --permissive
+ @bin/lesson_check.py -s . -p ${PARSER} -r _includes/links.md -l -w --permissive
## unittest : run unit tests on checking tools.
unittest :