You would need to look at the whole system to determine where the highest and lowest points are (or direction of flow), relative to each other. Then start bleeding from high to low. It doesn't matter which end point is farther away. The object is to avoid bleeding a lower point in a system before the higher point, otherwise a small amount of older fluid will be pulled from above and trapped in between. If the higher point is already clean, then pulling it downstream is OK. You can make a simple sketch of a reservoir with lines coming out at different levels to prove this for yourself.
In practice, on a system with four (or three) outlets from the MC, you would begin at the end of the line which is connected closest to the pedal. (But with primary and secondary supplies from the reservoir into the MC, effectively paralleling the supply to the secondary bore, there is a chance of trapping fluid between the primary and secondary bore. But the chances are smaller if one starts with the primary, the one closest to the pedal. And there are other considerations which the automaker has accounted for in their service manuals, which could lead to a different bleeding order.) I hope that all made sense.
