Certain chemicals cannot be stored with other chemicals in the same storeroom. Use graph coloring to determine the minimum number of storerooms needed to safely store the chemicals A.B.C.D,E.F and G based on this information:
A can't be stored with B.E or G.
B can't be stored with A.Cor E.
C can't be stored with B or D.
D can't be stored with C or G.
E can't be stored with A.B.F or G.
F can't be stored with E.
G can't be stored with A.D or E