map Constant ma s" xlerb" ma >value . ( creates new item in map ma and prints its address ) s" xlerb" ma >value . ( uses existing item in map ma and prints its address ) s" xlerb" ma >value @ . ( uses existing item in map ma and prints its value ) 99 s" xlerb" ma >value ! ( uses existing item in map ma and sets its value ) Map: mama s" xlerb" mama . ( creates new item in named map mama and prints its address ) s" xlerb" mama . ( uses existing item in named map mama and prints its address ) s" xlerb" mama @ . ( uses existing item in named map mama and prints its value ) 99 s" xlerb" mama ! ( uses existing item in named map mama and sets its value )