%problem from http://www.parade.com/askmarilyn/numbrix/archive/blueberry/Numbrix-20111012.html
#const n=9.
hint(1,1,43).
hint(1,5,11).
hint(1,9,23).
hint(2,2,41).
hint(2,5,14).
hint(2,8,25).
hint(5,1,47).
hint(5,2,38).
hint(5,8,30).
hint(5,9,29).
hint(8,2,53).
hint(8,5,60).
hint(8,8,73).
hint(9,1,55).
hint(9,5,59).
hint(9,9,75).
