I know from locally stored knowledge that:

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
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

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

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 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

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

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

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

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