2 cao hno3

2 cao hno32 cao hno32 cao hno32 cao hno3
2 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno3
2 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno3
2 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno3
2 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno32 cao hno3