Build the top
Build an edge and a bar, align the centres through the open slot, then complete the top.
WO and Bell
WO (Wedel–Odder) completes the top and uses a centre-solving sequence that preserves it. Bell starts with an edge and a bar, aligns centres through the remaining space, then completes the top with a sledge, hedge or edge cycle. They trade how much is planned before turning against the final case recognition.