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First page of The structures of 5‐(1‐imino‐N‐methylethylamino)‐3‐methyl‐1,2,4‐thiadiazole, 3,4‐dimethyl‐5‐[1‐(N‐methyliminio)ethylimino]‐1,2,4‐thiadiazoline tetrafluoroborate and 1,2,3,5,6‐pentamethyl‐1,3,4,6‐tetraaza‐6aλ4‐thiapentalenium tetrafluoroborate