Rangeary is a sub-class of Array and represents any 1-dimensional multiple-range, for example, (x<4 and 7<x<=9) or (x<="c" and "f"<=x), where the infinities can be abstract like nil or be defined by the user. All the standard logical operations, including negation, conjunction and disjunction, are supported and can be used with conventional Ruby-style operators. Each range is represented as RangeExtd class (Extended Range), which is a sub-class of Range and supports exclude-begin and open-ended (to Infinity) ranges, and is downloadable from https://rubygems.org/gems/range_extd