Why does dante place usurers blasphemers and sodomites together in Dante's Inferno?

why does dante place usurers blasphemers and sodomites together? I have a packet for Dante’s inferno. My teacher won’t tell me the answer but I can’t figure it out. They seem so unrelated and I don’t understand the irony in their punishment! I can understand the irony of the punishments in the other cantos but... show more why does dante place usurers blasphemers and sodomites together?
I have a packet for Dante’s inferno. My teacher won’t tell me the answer but I can’t figure it out. They seem so unrelated and I don’t understand the irony in their punishment! I can understand the irony of the punishments in the other cantos but this mind boggles me.
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