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It looks like a potato leaved variety, could you have got some seeds mixed up?
It looks like a blind, no growing tip
It could be an odd seed left in the machine from the last batch of tomato seeds that has dropped off when they changed variety, let it grow on and see what you get, dont listen to all them nasty people that want to kill it.
Give it a week Betty... if it breaks (produces a growing tip from the leaf joint) you have another plant, if not it probably won't so no use keeping it... :-\