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Twelve friends: Anna, Bill, Deb, Dory, Eliza, Gaby, Jan, John, Judy, Mary, Otto and Sam, were talking about their birthdays, and much to their surprise discovered that they were all born on different months and, in fact, that each of them was born on a month with at least two different letters in common with their own name.

In what months were each of the twelve friends born?

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My guess:

 Anna   January 
 Bill   April 
 Deb    September 
 Dory   December 
 Eliza  February 
 Gaby   May 
 Jan    June 
 John   November 
 Judy   July 
 Mary   March 
 Otto   October 
 Sam    August 

How?

Anna can only be January, Bill only April. Deb any of September, October, November and December. Otto can only be October, Jan only June, Eliza only February. July can only be Judy. Then John is November, Dory December and Deb is September.

 Anna   January 
 Bill   April 
 Deb    September
 Dory   December
 Eliza  February
 Gaby   May August
 Jan    June
 John   November
 Judy   July 
 Mary   March May
 Otto   October 
 Sam    March May August

This gives us three answers, one if Gaby is May and two if she is August.

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Another possible solution:

Anna    January
Bill April
Deb September
Dory December
Eliza February
Gaby August
Jan June
John November
Judy July
Mary May
Otto October
Sam March

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