new file:   2-lat.scm
	new file:   2-member.scm
	new file:   3-firsts.scm
	new file:   3-insertL.scm
	new file:   3-insertR.scm
	new file:   3-rember.scm
	new file:   3-subst.scm
	new file:   3-subst.scm~
	new file:   test.scm