Stingy Cages

Normal sudoku rules apply, i.e. each row, column and 3x3 region has to contain the digits from 1 to 9 once each. Digits in a cage must sum to the clue in the top left. STINGY CONDITION: Any two killer cages can have at most one digit in common. For example, if a cage contains the digits 1 and 2, no other cage may have both of these digits.