Select six different digits from the set 1-9. Use these six digits only to fill every cell such that a digit does not repeat in a row, column or box. Grey lines are entropic AND modular; i.e every 3-cell sequence on a line must contain a digit from {123}, one from {456} and {789}; also these digits must include one from {147}, one from {258} and one from {369}. Both indicated diagonals have the same sum. The inequality sign ‘points’ to the lower digit. Any 5 in the grid must have a 1 directly above it or a 9 directly below it (or both).