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Why I’m getting overlaps with fast Ethernet 0/1 when assigning an ip

You can't have two interfaces on the same subnet. In your case, you're trying to put both on You'll have to choose a different subnet for one of them.
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%Cannot create sub-interface

You cannot create a subinterface (L3) for a port that's in switchport (L2) mode. Remove the switchport mode (no switchport), then try again. If you do need to use switchport mode, you need to create a ...
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