C
clover141


1) ------>N-------->N1--------->N2------------>Fe2O3
Fe2O3
------>N--------->M1-------->M2------------>FeO
2)A------>B-------->C---------->Al2O3

Fe2O3
------>N--------->M1-------->M2------------>FeO
2)A------>B-------->C---------->Al2O3