Portal website application question?!

Sally, Dwayne, Anthony, David, and Franklin are, collectively, exactly 10 years apart in age!. Sally's is two years older than David!. David's favorite letter is 'g'!. Anthony's favorite letter is also 'g', but Dwayne has no preference, insisting that he likes all the letters equally except for 's'!. What is Franklin's favorite letter!?

I can't tell if the answer is supposed to be obvious!.!. and the answer is not 's'!.Www@Enter-QA@Com

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