list:
	find Chapters -newer Chapters.zip -print
	find code -newer code.zip -print
	find homework -newer homework.zip -print

all: Chapters.zip code.zip homework.zip

Chapters.zip: X
	rm -f Chapters.zip
	zip -rq Chapters.zip Chapters

code.zip: X
	rm -f code.zip
	zip -rq code.zip code

homework.zip: X
	rm -f homework.zip
	zip -rq homework.zip homework

X:
	@/bin/true