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1. , .
2. ϳ, , .
3. , get_month_birthday date .
4. ϳ, , .
. phone_list(Person,_,Date) ' ' Prson person Person. ' Date.
³, ' ' . '.
5. , Date. , , check_birthday_month.
6. , . check_birthday_month : ' , - . , check_birthday_month This_month n. Date b_date(Month,_,_). , ' , .
䳿 ' , .
7. check_birthday_month . ϳ, . , . fail. - '.
8. write_person ' , , fail .
5.4. '.
'.
ϳ , :
owns(john,book('From Here to Eternity','james Jones')).