A barber decided to do free hair cut for first time customers.
a gardner walks in, he gets a free hair cut and he is very happy next day he sends free flowers to the hair dresser.
a librarian walks in, he gets a free hair cut and he is very happy and next day he sends a free book to hair dresser.
a programmer walks in, he gets a free hair cut and he is very happy....
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next day 100 programmers visit the barber shop.