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The concept is to keep the stove, fridge, and sink all within around 7ft from each other, so it is user-friendly. Every time you cook, you don’t want to be running laps in the kitchen. It is the most commonly used method in kitchen design. I have seen some modern kitchens designed without using it more for a look. You could do a straight run as well. But try to keep the major appliances within 10-13ft of each other, and the kitchen will function much better.