The synthesis of 11H-1,2,4-triazolo[4,3-b]pyridazino[4,5-b]indoles, 11H-tetrazolo[4,5-b]pyridazino[4,5-b]indoles and 1,2,4-triazolo[3,4-f]-1,2,4-triazino[4,5-a]indoles

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