CHALLEGE - Find the eigth digit of the code.

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Across
  1. 4. Dairy product that melts when heated.
  2. 6. Fraction of DER everyone should take in at breakfast.
  3. 7. Product very rich in fats included in the Full English Breakfast.
  4. 8. Full English Breakfast ingredient of plant origin.
Down
  1. 1. Wheat, corn, oats and others like those.
  2. 2. Variable involved in the DER calculation.
  3. 3. It is delicious spread on toast.
  4. 4. Called “Media Luna” in Argentina.
  5. 5. In “DER”, what does “E” stand for?
  6. 9. Main ingredient in muesli and in porridge.