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A real world example of what? Math in general? Geometry nets? Name the math concept and it'll be easier for readers to give you a real world example.
Some examples of closed compound nouns are:arrowrootbaseballcardboarddeadbeatelderberryfireplacegoalposthouseboaticebergjumpsuitkeepsakelunchboxmeatloafnotebookoutsideportholequartermasterrooftopsoapsudstenderfootunderdogviewpointwarthogyearbookzooplankton
1, 2, 3, 4, 5 Anything that doesn't have a fraction or decimal.
No, by definition. A proper subset is a subset that contains some BUT NOT ALL elements of the original set.