Repeating Matches

Hi. I am new to SQL.I hope you veteran out there to help me solve the simple problem i met.

CREATE TABLE BASKET(
B# NUMBER(6) NOT NULL,
ITEM VARCHAR(6) NOT NULL,
CONSTRAINT BASKET_PKEY PRIMARY KEY(B#, ITEM) );

My statement

SELECT DISTINCT L1.ITEM, L2.ITEM,COUNT(L1.B#)
FROM BASKET L1 ,BASKET L2
WHERE L1.B# = L2.B#
AND L1.ITEM <> L2.ITEM
GROUP BY L1.ITEM,L2.ITEM;

the result is

ITEM ITEM COUNT(L1.B#)
------ ------ ------------
BEER MILK 5
BEER BREAD 4
BEER BUTTER 2
MILK BEER 5
MILK BREAD 6
MILK BUTTER 5
BREAD BEER 4
BREAD MILK 6
BREAD BUTTER 5
BUTTER BEER 2
BUTTER MILK 5
BUTTER BREAD 5

The problem is how to get rid those repeating group like (BEER,MILK) and (MILK,BREAD)?