class Numeric
    def cm
    end
    def degrees
    end
    def feet
    end
    def inch
    end
    def km
    end
    def m
    end
    def mile
    end
    def mm
    end
    def radians
    end
    def to_cm
    end
    def to_feet
    end
    def to_inch
    end
    def to_km
    end
    def to_l
    end
    def to_m
    end
    def to_mile
    end
    def to_mm
    end
    def to_yard
    end
    def yard
    end
end