I looked at the programming contest description for this event
<http://icpc.baylor.edu/icpc/> this year and realized that there is an
error in their problem description. Their first problem states that a
couple with A+ and B+ blood types can have a child with any blood type.
This is false if both parents have both alleles the same for either type
(AA or BB) or the Rh factor (++). I hope the students noticed this error.
Gus
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