1 . AGRICULTURE - BUTTER - DISPOSAL AT REDUCED PRICE - INVITATION TO TENDER - PROCESSING OF BUTTER - DEPOSIT - RELEASE - CONDITIONS - SUCCESSFUL TENDERER NOT CARRYING OUT PROCESSING HIMSELF - OBLIGATIONS ( REGULATION NO 1259/72 OF THE COMMISSION , ARTICLES 6 ( 1 ) ( C ) AND 18 ; REGULATION NO 1237/73 OF THE COMMISSION ) 2 . AGRICULTURE - BUTTER - DISPOSAL AT REDUCED PRICE - INVITATION TO TENDER - PROCESSING OF BUTTER - DEPOSIT - SYSTEM - VALIDITY ( REGULATION NO 1259/72 OF THE COMMISSION , ARTICLE 18 ( 2 ) ( A ))