    class
    	WEL_STANDARD_PENS

    General
    	cluster: wel
    	description: "Definition of the sixteen standard pens."

    Ancestors
    	ANY
    	WEL_PS_CONSTANTS
    	WEL_STANDARD_COLORS

    Queries
    	Black_pen: WEL_PEN
    	Blue_pen: WEL_PEN
    	Cyan_pen: WEL_PEN
    	Dark_blue_pen: WEL_PEN
    	Dark_cyan_pen: WEL_PEN
    	Dark_green_pen: WEL_PEN
    	Dark_grey_pen: WEL_PEN
    	Dark_magenta_pen: WEL_PEN
    	Dark_red_pen: WEL_PEN
    	Dark_yellow_pen: WEL_PEN
    	Green_pen: WEL_PEN
    	Grey_pen: WEL_PEN
    	Magenta_pen: WEL_PEN
    	Red_pen: WEL_PEN
    	White_pen: WEL_PEN
    	Yellow_pen: WEL_PEN