two parents with blood type a and b can have a child with blood type o |
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two parents with blood type a and blood type b can have a child with blood type o |
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two parents with blood type a negative can have a child with blood type o negative |
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two parents with blood types a and b can have a child with blood type o |
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two parents with blood types a and o can have two children with blood types a and o |
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