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  _  _      ___      _____      ___      _____   
 | \| ||   / _ \\   / ____||   / _ \\   |__  //  
 |  ' ||  / //\ \\ / //---`'  | / \ ||    / //   
 | .  || |  ___  ||\ \\___    | \_/ ||   / //__  
 |_|\_|| |_||  |_|| \_____||   \___//   /_____|| 
 `-` -`  `-`   `-`   `----`    `---`    `-----`

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Text this: "and"- and "or"-operations for "double", "triple", etc. fuzzy sets