In boolean algebra, people often wrongly think that there are only two logic states: true and false, or 1 and 0 in the world of digital logic. However in boolean algebra there are two super states. Care and don't care. That is in Care, the 1 and 0 are important. In don't care, their value is irrelevant to the outcome. Sometimes I talk abort the don't care state. That is something that is irrelevant to the end result. You can probably see how easily this is misinterpreted. But some people, from no Anglophile-societies work it out very quickly.