Secret A==s4:c0,c200.c511
Secret B==s4:c1,c200.c511
Secret AB==s4:c0,c1,c200.c511
Unclassified-Secret AB==s1-s4:c0,c1,c200.c511
Secret AB-Secret A==s4:c0,c1,c200.c511-s4:c0,c200.c511
Secret AB-Secret B==s4:c0,c1,c200.c511-s4:c1,c200.c511
Secret AB-Secret==s4:c0,c1,c200.c511-s4:c200.c511

# error
Secret C==Secret C
Secret C-Secret D==Secret C-Secret D