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What type of isomers are the following :
`(i) [Mn(CO)_(5)SCN] and [Mn(CO)_(5)NCS]`
`(ii) [Co(en)_(3)[Cr(CN)_(6)] and [Cr(en)_(3)][Co(CN)_(6)]`
`(iii) [Co(NH_(3))_(5)NO_(3)]SO_(4) and [Co(NH_(3))_(5)SO_(4)]NO_(3)`
`(iv) [Co(H_(2)O)_(2)Cl_(2)(py)_(2)]Cl and [Co(H_(2)O)Cl_(3)(py)_(2)]H_(2)O`