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I'm suggesting that you leave the soil at existing grade coming out from the house about 5-6' in order to give yourself a planting bed along the house. Then cut the patio in so that the surface is sloped 1-2% and landing even with the foot of the stairs. You would then put a retaining wall between the planting bed and the patio with a step a few feet in front of the slider. Seeing that it is only half a foot difference, I would not have the wall, but only a step. The bed could roll down to the patio without a wall. The patio will have a nice tucked in look. I would not necessarily square any of the patio, but continue curving it in front of the foundation planting.
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