CLASSPATH=./gen:$CLASSPATH java Main < statistics.input
 object which was read 
: Container  (
	<contents> : Item_List  {
		<first> : Nonempty_Item_List  (
			<it> : Simple  (
				<name> : ItemName  (
					<i>  : Ident "apple" )
				<w> : Weight  (
					<i>  : int "12" ) )
			<next> : Nonempty_Item_List  (
				<it> : Container  (
					<contents> : Item_List  {
						<first> : Nonempty_Item_List  (
							<it> : Simple  (
								<name> : ItemName  (
									<i>  : Ident "apple" )
								<w> : Weight  (
									<i>  : int "10" ) ) ) }
					<capacity> : Capacity  (
						<i>  : int "10" ) )
				<next> : Nonempty_Item_List  (
					<it> : Simple  (
						<name> : ItemName  (
							<i>  : Ident "pear" )
						<w> : Weight  (
							<i>  : int "9" ) )
					<next> : Nonempty_Item_List  (
						<it> : Container  (
							<contents> : Item_List  {
								<first> : Nonempty_Item_List  (
									<it> : Simple  (
										<name> : ItemName  (
											<i>  : Ident "apple" )
										<w> : Weight  (
											<i>  : int "8" ) ) ) }
							<capacity> : Capacity  (
								<i>  : int "10" ) )
						<next> : Nonempty_Item_List  (
							<it> : Simple  (
								<name> : ItemName  (
									<i>  : Ident "kiwi" )
								<w> : Weight  (
									<i>  : int "6" ) ) ) ) ) ) ) }
	<capacity> : Capacity  (
		<i>  : int "50" ) )done DisplayVisitor 
count
sum
12.0 = partial result
count
sum
11.0 = partial result
count
sum
10.333333 = partial result
count
sum
9.75 = partial result
count
sum
9.0 = partial result
done 9.0