1-1 is a mathematical expression that evaluates to: 0 (number) (in ordinary arithmetic) The term 1-1 may refer to: New Year's Day, a public holiday in many countries, held annually on the first of January Schweizer SGP 1-1, an American glider design World 1-1, the first level of Nintendo's Super Mario Bros.
1-1 is a mathematical expression that evaluates to: 0 (number) (in ordinary arithmetic) The term 1-1 may refer to: New Year's Day, a public holiday in many countries, held annually on the first of January Schweizer SGP 1-1, an American glider design World 1-1, the first level of Nintendo's Super Mario Bros.
Source: Wikipedia "1-1" · CC BY-SA 4.0
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