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1 N2O5
2 Cl2O7
3 HCl
4 CO2
5 HF
6 Al4C3
7 SO3
8 HI
9 PbH4
10 CaH2
11 Ga2Se3
12 Mn2O7
13 BaCl2
14 Li2S
15 NaCl
16 HgO
17 AgH
18 TiO2
19 AuH3
20 Fe2O3
20
8
3
13
18
7
9
10
16
17
4
2
11
1
5
19
15
12
6
14