_:dnkXocmW626 . _:dnkXocmW626 "Boolean_algebra_$0028basic_concepts$0029". . . . . . . . _:dnkXocmW626. _:dnkXocmW627. _:dnkXocmW630. _:dnkXocmW624. _:dnkXocmW631. _:dnkXocmW628. _:dnkXocmW625. _:dnkXocmW629. "Introduction to Boolean algebra"@en. . "Source: Freebase - The World's database". . "Boolean algebra"@en. . . . _:dnkXocmW627 . _:dnkXocmW627 "Boolean_search". _:dnkXocmW630 . _:dnkXocmW630 "Introduction_to_Boolean_algebra". _:dnkXocmW624 . _:dnkXocmW624 "15410556". _:dnkXocmW631 . _:dnkXocmW631 "Introduction_to_boolean_algebra". _:dnkXocmW628 . _:dnkXocmW628 "Elementary_Boolean_algebra". _:dnkXocmW625 . _:dnkXocmW625 "Boolean_algebra_$0028introduction$0029". _:dnkXocmW629 . _:dnkXocmW629 "Boolean_searching".