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Fatima, In order for landings to be considered supported so you can consider a smaller length of stairs. stair length = 'total length - 2 x landing length' , you need to have both Beams C and D at 6'6" level and again have 2 Beams B and C in this case at 11'6" level. In that way both landings are 2 way supported and the stair flight between them can be considered as one way. You will have to design the landings as two way supported on two edges only. Thanks.