which_year_was_anna_kournikova_born_in

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How do we know this?

Anna Kournikova (born 1981), the Russian tennis player is born on (has as his or her date of birth) which year?

Facts
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Show reasoning
Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:

June 7th 1981 is the birthdate of Anna Kournikova ([fact: ["126875522@trueknowledge.com"]])

June 7th 1981 is the birthdate of Anna Kournikova ([fact: ["126875522@trueknowledge.com"]])

is the same as or a more accurate version of
is a more general form of
is a more accurate version of
([fact: ["1154455658@trueknowledge.com"]])

permanent
applies to
is the same as or a more accurate version of
([fact: ["1154274674@trueknowledge.com"]])

By calculation (generator: ["more_accurate_version5@trueknowledge.com"]) I know that:

June 7th 1981 is a more accurate version of 1981

June 7th 1981 is a more accurate version of 1981

June 7th 1981
is a more accurate version of
June 1981

By calculation (generator: ["moregeneral4@trueknowledge.com"]) I know that:

June 7th 1981 is the same as or a more accurate version of 1981

June 7th 1981 is the same as or a more accurate version of 1981

By calculation (generator: ["strictequal1@trueknowledge.com"]) I know that:

1981 is strictly equal to 1981

1981 is strictly equal to 1981

By calculation (generator: ["regex2@trueknowledge.com"]) I know that:

"1981" is a string that contains the regular expression "^([0-9-]+)"

"1981" is a string that contains the regular expression "^([0-9-]+)"

"1981"
is the substring of the string and regular expression at index
"1981", "^([0-9-]+)" and 1

By calculation (generator: ["year_component@trueknowledge.com"]) I know that:

1981 is the year component of 1981

1981 is the year component of 1981

By calculation (generator: ["calendar_year@trueknowledge.com"]) I know that:

1981 is a calendar year

1981 is a calendar year

By calculation (generator: ["more_accurate_version5@trueknowledge.com"]) I know that:

June 1981 is a more accurate version of 1981

June 1981 is a more accurate version of 1981

By calculation (generator: ["moregeneral4@trueknowledge.com"]) I know that:

June 1981 is the same as or a more accurate version of 1981

June 1981 is the same as or a more accurate version of 1981

I used the following facts to provide this answer:

June 7th 1981 is the birthdate of Anna Kournikova

'is the same as or a more accurate version of' is a more general form of 'is a more accurate version of'

'is the same as or a more accurate version of' is permanent

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