Constraints for a party

• Automatically have that crews do not split

  • we have to allocate location of whole crew at once

• Need to link up primary and secondary variables

  • using constraints summarised on previous slide
    • e.g. vght = 1 ? hgt = h

• Other constraints now expressible

• First one does not need secondary vars:

  • Crews do not visit same boat twice
    • AllDifferent(hg1,hg2, …, hg6)
      • one for all g = 1, 2, … 26

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