So there can be only 2 instances of a name, with 2 votes (possibly the same vote, or not). But which is it that you might err on while entering data - the first input of the name? Or the second input of the name? The votes? Each voter has the same vote value options? Some data entry errors can be reduced by allowing only combo choices (such as only Vote A or Vote B), or prevent names from being misspelled by choosing from combos or list boxes, but you can't prevent every error. Without preventive measures, an incorrect choice of any option is still a possibility, as is adding a name (or other option) where that option already exists.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.