#first set generates normally
ABCD	#ABCD is the first set, store internally
BCD
ACD
ABD
ABC
AB
AC
BC
AD
BD
CD
A
B
C
D
#second set
is ABE a subset of ABCD? 
	NO -> print	#ABE is the first set, store internally
is AB a subset of ABCD?
	YES -> skip
is AE a subset of ABCD?
	NO -> print
is BE a subset of ABCD?
	NO -> print
is A a subset of ABCD?
	YES -> skip
is B a subset of ABCD?
	YES -> skip
is E a subset of ABCD?
	YES -> skip
#third set
is ABC a subset of ABCD?
	YES -> skip	
#generates nothing, stores nothing
#fourth set
is EF a subset of ABCD?
	NO -> is EF a subset of ABE?
		NO -> print
is E a subset of ABCD?
	NO -> is EF a subset of ABE?
		YES -> skip
is F a subset of ABCD?
	NO -> is F a subset of ABE?
		NO -> print

internally, we only need to store ABCD, ABE, and EF for 3 bytes of data stored - a 95.3% storage savings.